[I] [Feature](mongodb-cdc) Expose split-related CDC options for MongoDB [doris-flink-connector]

["ziyanTOP (via GitHub)" <gi...@apache.org>]

ziyanTOP opened a new issue, #665:
URL: https://github.com/apache/doris-flink-connector/issues/665

   ## Problem Summary
   
   Currently `mongodb-sync-database` does not expose several useful MongoDB CDC source options that are available in the underlying Flink CDC connector. Users cannot configure snapshot chunk granularity or reader behavior, which can lead to OOM when syncing large collections.
   
   ## Proposed Changes
   
   Expose the following MongoDB CDC source options as configurable parameters:
   
   - `scan.incremental.snapshot.chunk.size.mb`
   - `scan.incremental.snapshot.chunk.samples`
   - `split.meta.group.size`
   - `close.idle.readers`
   - `scan.full-changelog`
   - `scan.cursor.no-timeout`
   
   ## Checklist
   
   1. Does it affect the original behavior: No (adds new options)
   2. Has unit tests been added: No
   3. Has document been added or modified: No Need
   4. Does it need to update dependencies: No
   5. Are there any changes that cannot be rolled back: No


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