feat: add timestamp-based CDC resume for MongoDB

[vaibhav-datazip]

Description

This PR adds the ability to resume CDC (Change Data Capture) operations from a specific timestamp in MongoDB. This is particularly useful when:

• You need to start CDC from a known point in time
• You want to skip the initial backfill process
• You need to recover from a specific point after a failure or deletion of state file

Type of change

• New feature (non-breaking change which adds functionality)
• Bug fix (non-breaking change which fixes an issue)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

• Tested with MongoDB Atlas:

  • CDC sync with fresh state (no state file)
  • CDC sync with existing state file
  • CDC sync with timestamp flag and fresh state
  • CDC sync with timestamp flag and existing state

• Tested with Local Replica Set:

  • CDC sync with fresh state (no state file)
  • CDC sync with existing state file
  • CDC sync with timestamp flag and fresh state
  • CDC sync with timestamp flag and existing state

• Additional Test Cases:

  • Verified that backfill is skipped when using timestamp
  • Verified proper cursor handling
  • Verified that no resume tokens are skipped during CDC sync