functions: Add TIDB_MVCC_INFO, TIDB_ENCODE_INDEX_KEY and TIDB_ENCODE_RECORD_KEY

[dveeden]

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  • expression: support tidb encode key function tidb#51678

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-12-20 02:19:18.142673006 +0000 UTC m=+1182548.231475550: ☑️ agreed by tangenta.
• 2024-12-24 01:01:19.806683259 +0000 UTC m=+1523469.895485797: ☑️ agreed by hfxsd.

[hfxsd]

/approve

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.5: #19902.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.4: #19903.