Enhance Java Development Configuration and Code Formatting (#2991)

# Description of Changes

Please provide a summary of the changes, including:

This PR improves Java development settings and code formatting by:
- Removing the deprecated `Checkstyle` extension from
`.vscode/extensions.json`.
- Updating `.vscode/settings.json` with:
  - Structured formatting for better readability.
  - Improved Java formatting with `google-java-format`.
  - Enhanced auto-save behavior.
  - Additional Java cleanup actions for better code quality.
  - Optimized project resource filtering.
  - More precise import sorting and ordering.
- Refining `build.gradle` to:
- Extend the `importOrder` rule to include `jakarta`, `lombok`, `me`,
and `stirling`.
  - Improve `spotless` formatting configurations.

These changes streamline the development workflow, enhance code
consistency, and improve maintainability.

---

## Checklist

### General

- [x] I have read the [Contribution
Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md)
- [x] 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)
- [x] I have performed a self-review of my own code
- [x] 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.

build.gradle

@@ -260,7 +260,7 @@ spotless {
 
         googleJavaFormat("1.25.2").aosp().reorderImports(false)
 
-        importOrder("java", "javax", "org", "com", "net", "io")
+        importOrder("java", "javax", "org", "com", "net", "io", "jakarta", "lombok", "me", "stirling")
         toggleOffOn()
         trimTrailingWhitespace()
         leadingTabsToSpaces()
@@ -272,7 +272,7 @@ sonar {
     properties {
         property "sonar.projectKey", "Stirling-Tools_Stirling-PDF"
         property "sonar.organization", "stirling-tools"
-        
+
         property "sonar.exclusions", "**/build-wrapper-dump.json, src/main/java/org/apache/**, src/main/resources/static/pdfjs/**, src/main/resources/static/pdfjs-legacy/**, src/main/resources/static/js/thirdParty/**"
         property "sonar.coverage.exclusions", "src/main/java/org/apache/**, src/main/resources/static/pdfjs/**, src/main/resources/static/pdfjs-legacy/**, src/main/resources/static/js/thirdParty/**"
         property "sonar.cpd.exclusions", "src/main/java/org/apache/**, src/main/resources/static/pdfjs/**, src/main/resources/static/pdfjs-legacy/**, src/main/resources/static/js/thirdParty/**"
@@ -297,14 +297,14 @@ dependencies {
 	implementation 'ch.qos.logback:logback-core:1.5.15'
     implementation 'ch.qos.logback:logback-classic:1.5.15'
 
-    
-    // Exclude vulnerable BouncyCastle version used in tableau 
+
+    // Exclude vulnerable BouncyCastle version used in tableau
     configurations.all {
         exclude group: 'org.bouncycastle', module: 'bcpkix-jdk15on'
         exclude group: 'org.bouncycastle', module: 'bcutil-jdk15on'
         exclude group: 'org.bouncycastle', module: 'bcmail-jdk15on'
     }
-    
+
     if (System.getenv("STIRLING_PDF_DESKTOP_UI") != "false") {
         implementation 'org.apache.commons:commons-compress:1.26.0'
         implementation "me.friwi:jcefmaven:127.3.1"