v8.4: add APPLY, RECOMMEND, TIDB_CURRENT_TSO keywords

[Oreoxmt]

What is changed, added or deleted? (Required)

TiDB v8.4.0:

• introduces APPLY and RECOMMEND as non-reserved keywords (ref parser: change keyword TiDB_CURRENT_TSO to TIDB_CURRENT_TSO tidb#55258)
• updates a reserved keyword from TiDB_CURRENT_TSO to TIDB_CURRENT_TSO (ref planner: support new syntax for Index Advisor tidb#55947)

Which TiDB version(s) do your changes apply to? (Required)

Tips for choosing the affected version(s):

By default, CHOOSE MASTER ONLY so your changes will be applied to the next TiDB major or minor releases. If your PR involves a product feature behavior change or a compatibility change, CHOOSE THE AFFECTED RELEASE BRANCH(ES) AND MASTER.

For details, see tips for choosing the affected versions.

• master (the latest development version)
• v8.4 (TiDB 8.4 versions)
• v8.3 (TiDB 8.3 versions)
• v8.2 (TiDB 8.2 versions)
• v8.1 (TiDB 8.1 versions)
• v7.5 (TiDB 7.5 versions)
• v7.1 (TiDB 7.1 versions)
• v6.5 (TiDB 6.5 versions)
• v6.1 (TiDB 6.1 versions)
• v5.4 (TiDB 5.4 versions)
• v5.3 (TiDB 5.3 versions)

What is the related PR or file link(s)?

• This PR is translated from: v8.4: add APPLY, RECOMMEND, TIDB_CURRENT_TSO keywords docs#19122
• Other reference link(s):

Do your changes match any of the following descriptions?

• Delete files
• Change aliases
• Need modification after applied to another branch
• Might cause conflicts after applied to another branch

[ti-chi-bot]

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[Oreoxmt]

/cc @fixdb

[ti-chi-bot]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-10-21 09:56:02.288795785 +0000 UTC m=+258562.985586396: ☑️ agreed by qiancai.

[Oreoxmt]

/approve
/unhold

[ti-chi-bot]

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