Enabling rendering of stamp annotations and Freetext annotations

Flag: android.graphics.pdf.flags.enable_edit_pdf_text_annotations
Flag: android.graphics.pdf.flags.enable_edit_pdf_stamp_annotations
API-Coverage-Bug: 382254176
NO_IFTTT=Made changes in both file
Test: manually
Bug: 379008463

Change-Id: I333e165faf458d7f85fb9b538450a035d75ae5c4