[HUDI-3478] Implement CDC Read in Spark

[YannByron]

Change Logs

This PR is going to support CDC Read in Spark.

The changes are listed:

1. extract some cdc common classes in hudi-common that will be used to implement CDCReader for different engines;
2. CDCReader to response the CDC query on spark.

Impact

Low

[YannByron]

@xushiyan @prasannarajaperumal @alexeykudinkin please continue to review this. and i will submit a following commit that use the avro format, not json format, to persist the fields.

[nsivabalan]

cancelling all azure CI runs for now to investigate CI flakiness. will retrigger build once we are in stable state. sorry about the inconvenience.

[hudi-bot]

CI report:

• e2989860bc2240b23ba1a7cfc1efad59c5d5ead6 Azure: SUCCESS

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• @hudi-bot run azure re-run the last Azure build