planner: use normalSQL to build the plan cache key

[Reminiscent]

What problem does this PR solve?

Issue Number: close #31056

Problem Summary:
We do not clean the plan cache when execute stmt.close.

What is changed and how it works?

Use normalSQL to build the plan cache key

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
  @dbsid Use the internal test cases to verify this PR.
• 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

None

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• qw4990
• rebelice

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After your PR has acquired the required number of LGTMs, you can assign this pull request to the committer in the list by filling /assign @committer in the comment to help you merge this pull request.

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[dbsid]

/run-build-arm64 comment=true

[sre-bot]

download tidb binary(linux arm64) at http://fileserver.pingcap.net/download/builds/pingcap/test/tidb/4cf9f0be3d910a342c7f1889c244db5d74d08cfc/centos7/tidb-linux-arm64.tar.gz

[Reminiscent]

/run-check_dev

[VelocityLight]

/merge

[ti-chi-bot]

@VelocityLight: /merge is only allowed for the committers, you can assign this pull request to the committer in list by filling /assign @committer in the comment to help merge this pull request.

In response to this:

/merge

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