parser: add parser rules to support kill '1'

[znhh6018]

What problem does this PR solve?

Issue Number: close #27932

Problem Summary:
add support for kill '1' , before this we just support kill 1
modify rules in parser.y , if it's '1' , use strconv.Atoi() to convert '1' to 1.
If we input kill 'asd' ,strconv.Atoi() wil err and we just return 0 , it's consistent with mysql 8.0.

This is result in mysql 8.0.18
`mysql> kill '1';
ERROR 1094 (HY000): Unknown thread id: 1

mysql> kill 'asd';
ERROR 1094 (HY000): Unknown thread id: 0`
From this we can see , mysql will convert 'asd' to 0.

What is changed and how it works?

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

None

[ti-chi-bot]

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[sre-bot]

Code Coverage Details: https://codecov.io/github/pingcap/tidb/commit/7664abd2d50ec45b43c26ca3070c3a8977dc2abe

[znhh6018]

/cc @time-and-fate @bb7133

[znhh6018]

/run-check_dev_2

[djshow832]

I don't think it's a good idea to cast a string to an integer in the parser. I think storing the string in the AST and letting the SQL engine cast the value will be better. WDYT? @tangenta

[ti-chi-bot]

@znhh6018: PR needs rebase.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.5688%. Comparing base (9063d3b) to head (7664abd).
Report is 8579 commits behind head on master.

Additional details and impacted files

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- Coverage   63.5775%   63.5688%   -0.0088%     
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  Files           767        767                
  Lines        252361     252361                
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- Hits         160445     160423        -22     
- Misses        79150      79160        +10     
- Partials      12766      12778        +12