*: add support for -initialize-sql-file on first bootstrap (#35625)

[ti-chi-bot]

This is an automated cherry-pick of #35625

What problem does this PR solve?

Issue Number: close #35624

Problem Summary:

Because tidb persists global variables to the cluster, setting configuration requires first waiting for TiDB to listen and then a mysql client to connect and set initial values of the variables. This requires some clumsy automation scripts. It's much easier if the server can accept a SQL file with which to specify a set of SQL commands to execute on first bootstrap only.

What is changed and how it works?

A new option -initialize-sql-file is added to the tidb-server binary.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

A new option `-initialize-sql-file` is added to the tidb-server binary. This can be used as part of automation to specify an initial set of SQL commands to run on the first bootstrap of the tidb cluster.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• CbcWestwolf
• bb7133

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[bb7133]

LGTM

[bb7133]

/retest

[hawkingrei]

/merge

[ti-chi-bot]

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

Commit hash: d18f498