feat(merkle): Automate debug info collection and fix entities checkpo…

[VolodymyrBg]

…int tracking

This PR addresses two TODOs in the merkle stage implementation:

1. Adds automated debug information collection for state root errors

   • Introduces collect_state_root_debug_info helper function
   • Automatically gathers database stats with checksum
   • Formats debug report with all necessary information for issue reporting
   • Makes it easier for users to submit comprehensive bug reports

2. Implements proper entities checkpoint tracking during unwind

   • Updates the entities checkpoint to reflect the actual state after unwinding
   • Properly tracks processed and total entries
   • Ensures accurate progress reporting during the unwind process

The changes improve the developer and user experience by:

• Simplifying the process of reporting state root issues
• Providing more accurate progress tracking during unwind operations
• Making the codebase more maintainable by removing TODOs

Testing:

• Added unit tests for the new debug info collection function
• Verified checkpoint tracking in existing unwind tests
• Manual testing of the debug report format

Closes #XXXX (reference to tracking issue if exists)