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.

common/build.gradle

@@ -1,41 +1,9 @@
-plugins {
-    id 'java-library'
-    id 'io.spring.dependency-management' version '1.1.7'
-}
-
-group = 'stirling.software'
-version = '0.46.2'
-
-ext {
-    lombokVersion = "1.18.38"
-}
-
-java {
-    sourceCompatibility = JavaVersion.VERSION_17
-}
-
-repositories {
-    mavenCentral()
-}
-
-configurations.all {
-    exclude group: 'commons-logging', module: 'commons-logging'
-    exclude group: "org.springframework.boot", module: "spring-boot-starter-tomcat"
-}
-
-dependencyManagement {
-    imports {
-        mavenBom 'org.springframework.boot:spring-boot-dependencies:3.5.0'
-    }
-}
-
 dependencies {
     api 'org.springframework.boot:spring-boot-starter-web'
     api 'org.springframework.boot:spring-boot-starter-thymeleaf'
     api 'com.googlecode.owasp-java-html-sanitizer:owasp-java-html-sanitizer:20240325.1'
     api 'com.fathzer:javaluator:3.0.6'
     api 'com.posthog.java:posthog:1.2.0'
-    api 'io.github.pixee:java-security-toolkit:1.2.1'
     api 'org.apache.commons:commons-lang3:3.17.0'
     api 'com.drewnoakes:metadata-extractor:2.19.0' // Image metadata extractor
     api 'com.vladsch.flexmark:flexmark-html2md-converter:0.64.8'
@@ -44,9 +12,4 @@ dependencies {
     api 'org.snakeyaml:snakeyaml-engine:2.9'
     api "org.springdoc:springdoc-openapi-starter-webmvc-ui:2.8.8"
     api 'jakarta.mail:jakarta.mail-api:2.1.3'
-    compileOnly "org.projectlombok:lombok:$lombokVersion"
-    annotationProcessor "org.projectlombok:lombok:$lombokVersion"
-
-    testImplementation "org.springframework.boot:spring-boot-starter-test"
-    testRuntimeOnly 'org.mockito:mockito-inline:5.2.0'
 }