Tracking: automatically schema change for cdc table

[StrikeW]

We are going to support the automatic schema change for MySQL CDC. When upstream executed a ALTER TABLE ADD/DROP column statement, it will be replicated automatically to the corresponding Table.

• Extend the CDC connector to emit and parse the schema change message feat(cdc): parse debezium schema event for mysql #17707

• Source executor initiate a RPC to the Meta to start the config change procesure feat(cdc): auto schema change for mysql cdc #17876

  • construct a streaming graph for the new Table job, this is challenging since the schema change is initiated from CN instead of FE
  • pass the new streaming graph to Meta and start the config change process

• Save failed auto schema change DDL into event log

• Fill in the newly added cdc_table_id field in Table catalog

• Adding metrics for auto schema change trigger count, failure count and duration #17985

• feat(postgres-cdc): support replicating Postgres schema change #18760