Multi module refactor (#3640)

# Description of Changes

Migrated Stirling PDF to a multi-module structure:

* Introduced new `:stirling-pdf` module
* Moved all the core logic and features of Stirling PDF into
`:stirling-pdf`
* Updated paths of jobs and scripts

---

## Checklist

### General

- [ ] I have read the [Contribution
Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md)
- [ ] I have read the [Stirling-PDF Developer
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/DeveloperGuide.md)
(if applicable)
- [ ] I have read the [How to add new languages to
Stirling-PDF](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/HowToAddNewLanguage.md)
(if applicable)
- [ ] I have performed a self-review of my own code
- [ ] My changes generate no new warnings

### Documentation

- [ ] I have updated relevant docs on [Stirling-PDF's doc
repo](https://github.com/Stirling-Tools/Stirling-Tools.github.io/blob/main/docs/)
(if functionality has heavily changed)
- [ ] I have read the section [Add New Translation
Tags](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/HowToAddNewLanguage.md#add-new-translation-tags)
(for new translation tags only)

### UI Changes (if applicable)

- [ ] Screenshots or videos demonstrating the UI changes are attached
(e.g., as comments or direct attachments in the PR)

### Testing (if applicable)

- [ ] I have tested my changes locally. Refer to the [Testing
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/DeveloperGuide.md#6-testing)
for more details.

.github/labeler-config.yml

@@ -1,60 +1,45 @@
 Translation:
   - changed-files:
-    - any-glob-to-any-file: 'src/main/resources/messages_*_*.properties'
+    - any-glob-to-any-file: 'stirling-pdf/src/main/resources/messages_*_*.properties'
     - any-glob-to-any-file: 'scripts/ignore_translation.toml'
-    - any-glob-to-any-file: 'src/main/resources/templates/fragments/languages.html'
+    - any-glob-to-any-file: 'stirling-pdf/src/main/resources/templates/fragments/languages.html'
 
 Front End:
   - changed-files:
-    - any-glob-to-any-file: 'src/main/resources/templates/**/*'
-    - any-glob-to-any-file: 'src/main/resources/static/**/*'
-    - any-glob-to-any-file: 'src/main/java/stirling/software/SPDF/controller/web/**'
-    - any-glob-to-any-file: 'src/main/java/stirling/software/SPDF/UI/**/*'
+    - any-glob-to-any-file: 'stirling-pdf/src/main/resources/templates/**/*'
+    - any-glob-to-any-file: 'stirling-pdf/src/main/resources/static/**/*'
+    - any-glob-to-any-file: 'stirling-pdf/src/main/java/stirling/software/SPDF/controller/web/**'
+    - any-glob-to-any-file: 'stirling-pdf/src/main/java/stirling/software/SPDF/UI/**/*'
 
 Java:
   - changed-files:
-    - any-glob-to-any-file: 'src/main/java/**/*.java'
+    - any-glob-to-any-file: 'common/src/main/java/**/*.java'
+    - any-glob-to-any-file: 'proprietary/src/main/java/**/*.java'
+    - any-glob-to-any-file: 'stirling-pdf/src/main/java/**/*.java'
 
 Back End:
   - changed-files:
-    - any-glob-to-any-file: 'src/main/java/stirling/software/SPDF/config/**/*'
-    - any-glob-to-any-file: 'src/main/java/stirling/software/SPDF/controller/**/*'
-    - any-glob-to-any-file: 'src/main/resources/settings.yml.template'
-    - any-glob-to-any-file: 'src/main/resources/application.properties'
-    - any-glob-to-any-file: 'src/main/resources/banner.txt'
+    - any-glob-to-any-file: 'stirling-pdf/src/main/java/stirling/software/SPDF/config/**/*'
+    - any-glob-to-any-file: 'stirling-pdf/src/main/java/stirling/software/SPDF/controller/**/*'
+    - any-glob-to-any-file: 'stirling-pdf/src/main/resources/settings.yml.template'
+    - any-glob-to-any-file: 'stirling-pdf/src/main/resources/application.properties'
+    - any-glob-to-any-file: 'stirling-pdf/src/main/resources/banner.txt'
     - any-glob-to-any-file: 'scripts/png_to_webp.py'
     - any-glob-to-any-file: 'split_photos.py'
 
 Security:
   - changed-files:
-    - any-glob-to-any-file: 'src/main/java/stirling/software/SPDF/config/interfaces/DatabaseInterface.java'
-    - any-glob-to-any-file: 'src/main/java/stirling/software/SPDF/config/security/**/*'
-    - any-glob-to-any-file: 'src/main/java/stirling/software/SPDF/controller/api/DatabaseController.java'
-    - any-glob-to-any-file: 'src/main/java/stirling/software/SPDF/controller/api/EmailController.java'
-    - any-glob-to-any-file: 'src/main/java/stirling/software/SPDF/controller/api/H2SQLController.java'
-    - any-glob-to-any-file: 'src/main/java/stirling/software/SPDF/controller/web/AccountWebController.java'
-    - any-glob-to-any-file: 'src/main/java/stirling/software/SPDF/controller/web/DatabaseWebController.java'
-    - any-glob-to-any-file: 'src/main/java/stirling/software/SPDF/controller/api/UserController.java'
-    - any-glob-to-any-file: 'src/main/java/stirling/software/SPDF/model/api/Email.java'
-    - any-glob-to-any-file: 'src/main/java/stirling/software/SPDF/model/exception/BackupNotFoundException.java'
-    - any-glob-to-any-file: 'src/main/java/stirling/software/SPDF/model/exception/NoProviderFoundExceptionjava'
-    - any-glob-to-any-file: 'src/main/java/stirling/software/SPDF/model/provider/**/*'
-    - any-glob-to-any-file: 'src/main/java/stirling/software/SPDF/model/AuthenticationType.java'
-    - any-glob-to-any-file: 'src/main/java/stirling/software/SPDF/model/ApiKeyAuthenticationToken.java'
-    - any-glob-to-any-file: 'src/main/java/stirling/software/SPDF/model/AttemptCounter.java'
-    - any-glob-to-any-file: 'src/main/java/stirling/software/SPDF/model/Authority.java'
-    - any-glob-to-any-file: 'src/main/java/stirling/software/SPDF/model/PersistentLogin.java'
-    - any-glob-to-any-file: 'src/main/java/stirling/software/SPDF/model/SessionEntity.java'
+    - any-glob-to-any-file: 'proprietary/src/main/java/stirling/software/proprietary/security/**/*'
     - any-glob-to-any-file: 'scripts/download-security-jar.sh'
     - any-glob-to-any-file: '.github/workflows/dependency-review.yml'
     - any-glob-to-any-file: '.github/workflows/scorecards.yml'
 
 API:
   - changed-files:
-    - any-glob-to-any-file: 'src/main/java/stirling/software/SPDF/config/OpenApiConfig.java'
-    - any-glob-to-any-file: 'src/main/java/stirling/software/SPDF/controller/web/MetricsController.java'
-    - any-glob-to-any-file: 'src/main/java/stirling/software/SPDF/controller/api/**/*'
-    - any-glob-to-any-file: 'src/main/java/stirling/software/SPDF/model/api/**/*'
+    - any-glob-to-any-file: 'stirling-pdf/src/main/java/stirling/software/SPDF/config/OpenApiConfig.java'
+    - any-glob-to-any-file: 'stirling-pdf/src/main/java/stirling/software/SPDF/controller/web/MetricsController.java'
+    - any-glob-to-any-file: 'stirling-pdf/src/main/java/stirling/software/SPDF/controller/api/**/*'
+    - any-glob-to-any-file: 'stirling-pdf/src/main/java/stirling/software/SPDF/model/api/**/*'
     - any-glob-to-any-file: 'scripts/png_to_webp.py'
     - any-glob-to-any-file: 'split_photos.py'
     - any-glob-to-any-file: '.github/workflows/swagger.yml'
@@ -88,7 +73,9 @@ Devtools:
 Test:
   - changed-files:
     - any-glob-to-any-file: 'cucumber/**/*'
-    - any-glob-to-any-file: 'src/test/**/*'
+    - any-glob-to-any-file: 'common/src/test/**/*'
+    - any-glob-to-any-file: 'proprietary/src/test/**/*'
+    - any-glob-to-any-file: 'stirling-pdf/src/test/**/*'
     - any-glob-to-any-file: 'src/testing/**/*'
     - any-glob-to-any-file: '.pre-commit-config'
     - any-glob-to-any-file: '.github/workflows/pre_commit.yml'