puller(cdc): simplify puller internal code

[hicqu]

What problem does this PR solve?

Issue Number: close #10574

What is changed and how it works?

After #10506 is merged, puller module just receives events and table ResolvedTs and then dispatches them. So we can move action into kv-client so that goroutines of puller can be removed totally.

Check List

Tests

• Unit test

Questions

Will it cause performance regression or break compatibility?

Do you need to update user documentation, design documentation or monitoring documentation?

Release note

None

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[hicqu]

/retest

[ti-chi-bot[bot]]

@hicqu: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
jenkins-ticdc/verify	f4c98651e10273b9b5ce16b85dbbf68ba933d695	link	true	/test verify

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[ti-chi-bot[bot]]

PR needs rebase.

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