feat: detect architecture/libc from wheel

[mayeut]

towards #512

Getting the musllinux version for cross-repaired musl wheels is not handled yet here.

fixes #390: the default platform is changed from highest policy to auto which represents the highest compatible platform tag for any given wheel.

[codecov]

Codecov Report

Attention: Patch coverage is 93.37979% with 19 lines in your changes missing coverage. Please review.

Project coverage is 92.62%. Comparing base (0c1b26b) to head (1d319cf).

Files with missing lines	Patch %	Lines
src/auditwheel/wheel_abi.py	83.63%	6 Missing and 3 partials ⚠️
src/auditwheel/lddtree.py	74.07%	4 Missing and 3 partials ⚠️
src/auditwheel/main_repair.py	96.00%	1 Missing and 1 partial ⚠️
src/auditwheel/main_show.py	95.45%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #548      +/-   ##
==========================================
+ Coverage   92.17%   92.62%   +0.45%     
==========================================
  Files          22       21       -1     
  Lines        1572     1736     +164     
  Branches      286      326      +40     
==========================================
+ Hits         1449     1608     +159     
- Misses         74       77       +3     
- Partials       49       51       +2     

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