[EPIC-6675] re-implement pdf-generation example

[Den-Rimus]

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[Copilot]

Pull request overview

This PR re-implements the pdf-generation example by splitting the original MainActivity into separate activities for PDF generation with and without OCR, along with corresponding layout changes.

Key Changes:

• Extracted PDF generation logic into two new activities: PdfActivity (without OCR) and PdfWithOcrActivity (with OCR)
• Simplified MainActivity to serve as a launcher screen with navigation buttons
• Migrated from sdk-package-1 to sdk-package-2 to include OCR functionality

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
classic-components-example/pdf-generation/src/main/res/layout/activity_pdf.xml	New layout file for PDF generation activities with image loader, grayscale checkbox, and progress indicator
classic-components-example/pdf-generation/src/main/res/layout/activity_main.xml	Refactored to display two navigation buttons (PDF and PDF with OCR) instead of image processing controls
classic-components-example/pdf-generation/src/main/java/io/scanbot/example/PdfWithOcrActivity.kt	New activity implementing PDF generation with OCR functionality
classic-components-example/pdf-generation/src/main/java/io/scanbot/example/PdfActivity.kt	New activity implementing PDF generation without OCR
classic-components-example/pdf-generation/src/main/java/io/scanbot/example/MainActivity.kt	Simplified to act as a launcher with navigation to PDF activities
classic-components-example/pdf-generation/src/main/AndroidManifest.xml	Added activity declarations for the two new PDF activities
classic-components-example/pdf-generation/build.gradle	Updated SDK package dependency and reorganized build configuration

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[4BooM04]

@Den-Rimus apply copilot comments please