audit: add getters for SCMs, Files and variantId

[rhubert]

Needed for sbom from audit generation

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.24%. Comparing base (ca1f5e7) to head (6cdb975).

Files with missing lines	Patch %	Lines
pym/bob/audit.py	50.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #700      +/-   ##
==========================================
- Coverage   89.25%   89.24%   -0.02%     
==========================================
  Files          50       50              
  Lines       16446    16452       +6     
==========================================
+ Hits        14679    14682       +3     
- Misses       1767     1770       +3     

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