*: introduce snapshot into analyze

[eurekaka]

What problem does this PR solve?

First PR to fix #23453

Problem Summary:

modify_count is not as expected.

What is changed and how it works?

Proposal: RFC for a More Accurate ModifyCount

What's Changed:

• add a column snapshot into mysql.stats_meta
• use a snapshot to scan the table for analyze
• introduce AnalyzeResults to wrap AnalyzeResult of a same table
• combine dumping of histograms for a task(i.e, histograms of a table in version 2 analyze) into a single transaction, and only update mysql.stats_meta once in the analyze
• check if newer version of stats already exists before dumping current snapshot analyze results

How it Works:

• snapshot check when dumping analyze results would be used in later PRs to solve concurrent analyze problems

Related changes

N/A

Check List

Tests

• Unit test

Side effects

N/A

Release note

• Introduce snapshot into analyze

[eurekaka]

/run-check_dev_2

[eurekaka]

/run-check_dev_2

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• time-and-fate
• winoros

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[eurekaka]

/merge

[ti-chi-bot]

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

Commit hash: cad0bc6