drainer/: Add ignore-txn-commit-ts to skip some txn (#685) #697
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What problem does this PR solve?
add ignore-txn-commit-ts to skip some txn.
use case: for some incompatible DDL, user may handle it manaually and want to skip this binlog, currentlly, usert can only change the checkpoint to skip this, the process is tedious and prone to error.
What is changed and how it works?
cherry-pick #685
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