Memory enhancements and PDF decompress API (#3129)

# Description of Changes

- PDF split by size to check size of PDF as it splits, avoids issue were
a PDFs size is different viewed vs saved due to compression caused by
repeated data etc.
- Additionally memory enhancements for PDF load to dynamically load in
memory vs scratch
- PDF Decompress API for PDF testing


## 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.

src/main/java/stirling/software/SPDF/controller/api/MergeController.java

@@ -12,7 +12,6 @@ import java.util.Comparator;
 import java.util.List;
 import java.util.stream.Collectors;
 
-import org.apache.pdfbox.Loader;
 import org.apache.pdfbox.multipdf.PDFMergerUtility;
 import org.apache.pdfbox.pdmodel.PDDocument;
 import org.apache.pdfbox.pdmodel.PDDocumentCatalog;
@@ -101,8 +100,8 @@ public class MergeController {
                 };
             case "byPDFTitle":
                 return (file1, file2) -> {
-                    try (PDDocument doc1 = Loader.loadPDF(file1.getBytes());
-                            PDDocument doc2 = Loader.loadPDF(file2.getBytes())) {
+                    try (PDDocument doc1 = pdfDocumentFactory.load(file1.getBytes());
+                            PDDocument doc2 = pdfDocumentFactory.load(file2.getBytes())) {
                         String title1 = doc1.getDocumentInformation().getTitle();
                         String title2 = doc2.getDocumentInformation().getTitle();
                         return title1.compareTo(title2);
@@ -152,7 +151,7 @@ public class MergeController {
             byte[] mergedPdfBytes = docOutputstream.toByteArray(); // Get merged document bytes
 
             // Load the merged PDF document
-            mergedDocument = Loader.loadPDF(mergedPdfBytes);
+            mergedDocument = pdfDocumentFactory.load(mergedPdfBytes);
 
             // Remove signatures if removeCertSign is true
             if (removeCertSign) {