Fix for 'generate_route_manifest' CLI

[tieneupin]

A recent FastAPI version update (around v0.128.3/4) broke the generate_route_manifest CLI. We previously extracted a URL endpoint path parameter's type information from the type_ attribute in the path parameter ModelField instance, which has been removed in said recent FastAPI version update. Further inspection indicates that it is a Pydantic v1 attribute, and has been phased out as part of deprecating Pydantic v1.

This PR replaces the use of the type_ attribute with the Pydantic v2 _type_adapter._type attribute, which contains the full type annotation of the path parameter. A helper function was introduced to extract the basic Python type from the annotation.

[codecov]

Codecov Report

❌ Patch coverage is 54.54545% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 46.64%. Comparing base (8fb34a2) to head (1039b57).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #740      +/-   ##
==========================================
- Coverage   46.65%   46.64%   -0.01%     
==========================================
  Files          91       91              
  Lines        9607     9615       +8     
  Branches     1255     1258       +3     
==========================================
+ Hits         4482     4485       +3     
- Misses       4912     4915       +3     
- Partials      213      215       +2     

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