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.

stirling-pdf/src/main/resources/static/css/imageHighlighter.css

@@ -0,0 +1,43 @@
+#image-highlighter {
+  position: fixed;
+  display: flex;
+  inset: 0;
+  z-index: 10000;
+  background-color: rgba(0, 0, 0, 0);
+  visibility: hidden;
+  align-items: center;
+  justify-content: center;
+  transition:
+    visbility 0.1s linear,
+    background-color 0.1s linear;
+}
+
+#image-highlighter > * {
+  max-width: 80vw;
+  max-height: 80vh;
+  animation: image-highlight 0.1s linear;
+  transition:
+    transform 0.1s linear,
+    opacity 0.1s linear;
+}
+
+#image-highlighter > *.remove {
+  transform: scale(0.8) !important;
+  opacity: 0 !important;
+}
+
+#image-highlighter:not(:empty) {
+  background-color: rgba(0, 0, 0, 0.37);
+  visibility: visible;
+}
+
+@keyframes image-highlight {
+  from {
+    transform: scale(0.8);
+    opacity: 0;
+  }
+  to {
+    transform: scale(1);
+    opacity: 1;
+  }
+}