Support attributes on impl block ; Improve ignore category message ; Fix external methods are wrong ignored

[fzyzcjy]

Changes

Close #2068

Checklist

• An issue to be fixed by this PR is listed above.
• New tests are added to ensure new features are working. Please refer to this page to see how to add a test.
• ./frb_internal precommit --mode slow (or fast) is run (it internal runs code generator, does auto formatting, etc).
• If this PR adds/changes features, documentations (in the ./website folder) are updated.
• CI is passing. Please refer to this page to see how to solve a failed CI.

Remark for PR creator

• ./frb_internal --help shows utilities for development.
• If fzyzcjy does not reply for a few days, maybe he just did not see it, so please ping him.

[codecov]

Codecov Report

Attention: Patch coverage is 90.24390% with 4 lines in your changes missing coverage. Please review.

Project coverage is 99.10%. Comparing base (a549b8d) to head (58b2166).

Files	Patch %	Lines
...ary/codegen/parser/mir/parser/function/real/mod.rs	88.00%	3 Missing ⚠️
...odegen/parser/mir/parser/function/real/argument.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2069   +/-   ##
=======================================
  Coverage   99.10%   99.10%           
=======================================
  Files         473      473           
  Lines       18908    18919   +11     
=======================================
+ Hits        18738    18749   +11     
  Misses        170      170           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.