restore: add rater for creating tables

[YuJuncen]

What problem does this PR solve?

Added a metric in log for collecting create table speed.

What is changed and how it works?

A new type TrivialRater was added, it records the time it was created and how many operations finished after that.

Check List

Tests

• Unit test
• Manual test (add detailed scripts or steps below)

Side effects

• Possible performance regression

Release note

• No release note

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• 3pointer
• kennytm

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[kennytm]

rest LGTM

[YuJuncen]

/merge

[ti-chi-bot]

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

Commit hash: 103d241

[ti-chi-bot]

@YuJuncen: Your PR was out of date, I have automatically updated it for you.

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/run-all-tests

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