tikv_util: add handled task counter for LazyWorker

[overvenus]

Add a metric to inspect the total number of tasks handled by a LazyWorker.

What is changed and how it works?

Issue Number: Close #16195

What's Changed:

Add a metric to inspect the total number of tasks handled by a LazyWorker.

Check List

Tests

• Unit test

Release note

None

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• Connor1996
• glorv

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[Connor1996]

LGTM

[overvenus]

/merge

[ti-chi-bot]

@overvenus: It seems you want to merge this PR, I will help you trigger all the tests:

/run-all-tests

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[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: c1cd832

[overvenus]

/hold

[overvenus]

/unhold

[overvenus]

/merge

[ti-chi-bot]

@overvenus: It seems you want to merge this PR, I will help you trigger all the tests:

/run-all-tests

You only need to trigger /merge once, and if the CI test fails, you just re-trigger the test that failed and the bot will merge the PR for you after the CI passes.

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[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: e7e23ee

[ti-chi-bot]

@overvenus: Your PR was out of date, I have automatically updated it for you.

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