Support parsing: WHEEL files

[abraemer]

Add support for parsing WHEEL files to extract the Tag field needed to reconstruct wheel filenames and create proper detailed PURLs.

• WHEEL file format example:

  Wheel-Version: 1.0
  Generator: bdist_wheel (0.35.1)
  Root-Is-Purelib: false
  Tag: cp27-cp27m-win_amd64
  

• The Tag field is needed to reconstruct the wheel filename

• Reference implementation exists: etc/scripts/utils_thirdparty.py#L1148

• This would enable proper detailed PURL construction for installed Python wheels

Upstream Reference

• Issue: Collect WHEEL files for installed python wheels aboutcode-org/scancode-toolkit#4214
• URL: Collect WHEEL files for installed python wheels aboutcode-org/scancode-toolkit#4214
• Title: Collect WHEEL files for installed python wheels
• State: open

Upstream Context

A WHEEL file has the Tag needed to reconstruct the file_name of the wheel to construct a proper detailed PURL:

[mstykow]

Cross-reference update: upstream aboutcode-org/scancode-toolkit currently has an open PR for this format:

• PR #4776: Collect WHEEL files for installed python wheels
  Collect WHEEL files for installed python wheels #4214 aboutcode-org/scancode-toolkit#4776

This reinforces that installed Python distribution metadata remains active follow-up work upstream.

[mstykow]

Related upstream issue: aboutcode-org/scancode-toolkit#4214