planner: add binding info for explain stmt

[Reminiscent]

What problem does this PR solve?

Issue Number: close issue#26401

Problem Summary:
Support show binding info when we execute explain stmt.

What is changed and how it works?

When we use the binding in the optimize phase for explain stmt, we add the bindSQL to the warning info.
After we use the explain to check the plan for the SQL. We can use show warnings to see which binding is matched the SQL.

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

• Support show binding info when we execute explain stmt.

[Reminiscent]

/cc @eurekaka

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• eurekaka
• rebelice

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[Reminiscent]

/merge

[ti-chi-bot]

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

Commit hash: c112d85

[Reminiscent]

/merge