Support overriding things in third party crate (part 2)

[fzyzcjy]

Changes

Please list issues fixed by this PR here, using format "Fixes #the-issue-number".

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 6.66667% with 14 lines in your changes are missing coverage. Please review.

Project coverage is 98.32%. Comparing base (977a7e1) to head (be893ea).
Report is 3 commits behind head on master.

❗ Current head be893ea differs from pull request most recent head d0c8536

Please upload reports for the commit d0c8536 to get more accurate results.

Files	Patch %	Lines
...r/hierarchical/third_party_override_transformer.rs	0.00%	14 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2013      +/-   ##
==========================================
- Coverage   98.38%   98.32%   -0.06%     
==========================================
  Files         410      410              
  Lines       16792    16801       +9     
==========================================
  Hits        16520    16520              
- Misses        272      281       +9     

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