cdc: add slow table Grafana panels

[overvenus]

What problem does this PR solve?

Issue Number: ref #4757

What is changed and how it works?

Add slow table Grafana panels

Check List

Tests

• Manual test

Questions

Will it cause performance regression or break compatibility?

No

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

No

Release note

Add slow table Grafana panels.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• 3AceShowHand
• asddongmen

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[overvenus]

/merge

[ti-chi-bot]

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

Commit hash: 908499a

[overvenus]

/merge

[ti-chi-bot]

@overvenus: Your PR was out of date, I have automatically updated it for you.

At the same time I will also trigger all tests for you:

/run-all-tests

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