refactor: refactor alter parser

[CookiePieWw]

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What's changed and what's your intention?

As title. Switch to pattern-matching similar to create_parser to increase readability and a little refine about error messages.

Checklist

• I have written the necessary rustdoc comments.
• I have added the necessary unit tests and integration tests.
• This PR requires documentation updates.

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[codecov]

Codecov Report

Attention: Patch coverage is 92.63158% with 7 lines in your changes missing coverage. Please review.

Project coverage is 83.92%. Comparing base (7a4276c) to head (afb01e8).
Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4933      +/-   ##
==========================================
- Coverage   84.17%   83.92%   -0.26%     
==========================================
  Files        1137     1137              
  Lines      210050   210095      +45     
==========================================
- Hits       176808   176319     -489     
- Misses      33242    33776     +534     

[fengjiachun]

LGTM