new feature about CDC Handler for 1 => N(multi row) data handle

[gjchoi]

I'd like to develop Custom CDC Handler for N data insert with 1 sinkData.
But I can't find any base kafka connect feature about this ( kafka connect options, SMT )
And CDCHandler, CDCOperation to make custom CDC Handle below

CdcOperation

WriteModel<BsonDocument> perform(SinkDocument doc);

CdcHandler

  public abstract Optional<WriteModel<BsonDocument>> handle(SinkDocument doc);

only support 1 => 1 data handle.

so I make a PR about this new feature

• sink connector option added ( change.data.capture.multi.row.handler )
• CdcMultiRowOperation, CdcMultiRowHanlder added
• modified sink task logic that return list and append to bulkWrite

Can you review this PR for new feature add?

or

Is there any other way for this I don't know?

[skecskes]

This would be nice to have. Or similarly, I would like to have WriteModelStrategy that can issue bulk list of commands, like spilt the input SinkDocument into multiple WriteModels, not just one. So that it would return List and not just one WriteModel.