reparo: fix can't decode bit type data (#1103)

[ti-chi-bot]

This is an automated cherry-pick of #1103

What problem does this PR solve?

close #1096

What is changed and how it works?

in #655, drainer will write Uint64 datum for mysql bit type. align reparo's behaviour

Check List

Tests

• Unit test
• Integration test

Code changes

Side effects

Related changes

• Need to cherry-pick to the release branch
• Need to be included in the release note

[ti-chi-bot]

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[ti-chi-bot]

@ti-chi-bot: This cherry pick PR is for a release branch and has not yet been approved by release team.
Adding the do-not-merge/cherry-pick-not-approved label.

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[VelocityLight]

This pull request is closed because it's related version has closed automatic cherry-picking.
If it's still needed, you can reopen it or just regenerate it using bot,
see:

• https://prow.tidb.io/command-help#cherrypick
• https://book.prow.tidb.net/#/plugins/cherrypicker

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• https://internals.tidb.io/t/topic/785