Allow users to override the automatic function rename

[fzyzcjy]

Changes

Close #2194

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

All modified and coverable lines are covered by tests ✅

Project coverage is 99.06%. Comparing base (9e5c6e5) to head (a5dbae8).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2227      +/-   ##
==========================================
- Coverage   99.06%   99.06%   -0.01%     
==========================================
  Files         488      488              
  Lines       20186    20184       -2     
==========================================
- Hits        19997    19995       -2     
  Misses        189      189              

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