syncer: support filter row by SQL expression (#1782)

[ti-chi-bot]

This is an automated cherry-pick of #1782

What problem does this PR solve?

support filter row changes by SQL expression

What is changed and how it works?

add an item in configuration files, example.

expression-filter:
  expr-1:
    schema: "expr_filter"
    table: "t1"
    insert-value-expr: "c_null IS NOT NULL"

note that schema and table don't support pattern matching.

parse the expression into SQL AST, using TiDB's AST rewriter to generate executor AST, evaluate each row changes to decide passing it.

Check List

Tests

• white-box: check can handle data types that go-mysql returns to DM
• every MySQL data type can be handled
• can filter by INSERT, old and new value of UDPATE, DELETE
• works during DDL, dropping the filtering column makes the filter disabled, adding the column back enables it again
• works on generated column
• the timestamp value in expression should explicitly specify timezone c_timestamp = '2021-01-01 12:34:56.5678+08:00'
• works on SQL functions ts > NOW()
• works on multiple column a*a + b*b = c*c
• benchmark
  sysbench using DM master branch c2a7514 and TiDB v5.1.0: CPS 28k ~ 30k, left mountain in picture 1
  Using DM this PR a591b16, not enable expression filter, CPS 28k ~ 29k, middle mountain in picture 1
  Using DM this PR a591b16, filter 1% INSERT of 1 of 4 tables, CPS 27k ~ 29k, right mountain in picture 1
  Using DM this PR a591b16, filter 99% INSERT of 1 of 4 tables, CPS 27k ~ 30k, picture 2

Code changes

• Has exported function/method change
• Has exported variable/fields change
• Has persistent data change

Side effects

• Possible performance regression
• Increased code complexity

Related changes

• Need to cherry-pick to the release branch
• Need to update the documentation
• Need to be included in the release note

[GMHDBJD]

LGTM

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• GMHDBJD
• lance6716

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[lance6716]

/merge

[ti-chi-bot]

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

Commit hash: c7bedb6