fix(path/unstable): support string | URL in the 2nd overload of basename, dirname, and extname

[kt3k]

This PR changes the (unstable) 2nd overloads of basename, dirname, and extname to accept string | URL type. Now the 2nd overloads show how the APIs look like when they are stabilized . This also reduces the internal use of any types.

related: #5537

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 96.32%. Comparing base (6aaf191) to head (f8b259b).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
path/basename.ts	0.00%	2 Missing ⚠️
path/dirname.ts	0.00%	1 Missing ⚠️
path/extname.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5904      +/-   ##
==========================================
- Coverage   96.32%   96.32%   -0.01%     
==========================================
  Files         484      484              
  Lines       39112    39110       -2     
  Branches     5739     5739              
==========================================
- Hits        37675    37673       -2     
  Misses       1393     1393              
  Partials       44       44              

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