Add -vv TRACE logging level

[abitrolly]

To reduce the output of policy checker unless requested.

[codecov]

Codecov Report

Attention: Patch coverage is 83.33333% with 2 lines in your changes missing coverage. Please review.

Project coverage is 91.20%. Comparing base (55bc5ee) to head (fc0360c).
Report is 90 commits behind head on main.

Files with missing lines	Patch %	Lines
src/auditwheel/main.py	71.42%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #382      +/-   ##
==========================================
- Coverage   92.42%   91.20%   -1.23%     
==========================================
  Files          23       23              
  Lines        1267     1273       +6     
  Branches      311      292      -19     
==========================================
- Hits         1171     1161      -10     
- Misses         55       61       +6     
- Partials       41       51      +10     

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[abitrolly]

TRACE level can probably be defined in the root __init__.py for convenience https://stackoverflow.com/questions/2183233/how-to-add-a-custom-loglevel-to-pythons-logging-facility/35804945#35804945

[abitrolly]

The output from versioned_symbols_policy is overly verbose, because it is called several times and each time iterates over all JSON policies, from here.

auditwheel/src/auditwheel/wheel_abi.py

Lines 221 to 223 in 55bc5ee

	policy_symbols[k].update(ext_symbols[k])
	result.append((versioned_symbols_policy(policy_symbols), policy_symbols))
	return result

In my case it is 64 times just for policy check without TRACE output.