sink(ticdc): refine sink interface and add init method (#5196)#5432

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ti-chi-bot wants to merge 1 commit intopingcap:release-5.0from ti-chi-bot:cherry-pick-5196-to-release-5.0

+1,781-2

Commits on May 16, 2022

This is an automated cherry-pick of pingcap#5196

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