Fix route manifest CLI output

[tieneupin]

The initial version of the generate_route_manifest CLI worked, but constructed a YAML file that did not conform to Prettier's formatting standards. After some digging, we found a way to override the built-int Dumper class with one that had indenting and string formatting behaviour that conforms exactly to Prettier's default format.

Additionally, now that we have dropped Python 3.9 (see PR #668), we have updated the type hinting used in the API endpoint functions to use the pipe union notation (e.g, str | int) instead, which makes type checking of incoming path parameters in the url_path_for() function easier to implement.

Finally, we added unit tests for the functions in murfey.util.api and the generate_route_manifest CLI.

[codecov]

Codecov Report

❌ Patch coverage is 66.00000% with 17 lines in your changes missing coverage. Please review.
✅ Project coverage is 34.37%. Comparing base (c6c286e) to head (f5aae34).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #678      +/-   ##
==========================================
- Coverage   34.40%   34.37%   -0.04%     
==========================================
  Files          92       92              
  Lines       11158    11625     +467     
  Branches     1474     1609     +135     
==========================================
+ Hits         3839     3996     +157     
- Misses       7195     7495     +300     
- Partials      124      134      +10     

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[stephen-riggs]

Looks good to me