planner: make queries with the extra column _tidb_rowid can use PointGet

[qw4990]

What problem does this PR solve?

Issue Number: close #31543

Problem Summary: planner: make queries with the extra column _tidb_rowid can use PointGet

What is changed and how it works?

planner: make queries with the extra column _tidb_rowid can use PointGet

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

planner: make queries with the extra column `_tidb_rowid` can use PointGet

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[ti-chi-bot]

@qw4990: PR needs rebase.

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