Explicitly implement audit subobjects and add compliance_count to AuditLastReport

[saberlynx]

What:

Why:

• LastReport was missing compliance_count field for audits.
• Task and Audits are different and Audits should not inherit so much from Task.

How:

Tests are still passing. New tests are also passing.

Checklist:

• Tests
• CHANGELOG Entry
• Documentation

[codecov]

Codecov Report

Merging #26 (438994e) into master (b586a93) will increase coverage by 0.21%.
The diff coverage is 92.36%.

@@            Coverage Diff             @@
##           master      #26      +/-   ##
==========================================
+ Coverage   96.84%   97.05%   +0.21%     
==========================================
  Files         122      121       -1     
  Lines        7315     7376      +61     
==========================================
+ Hits         7084     7159      +75     
+ Misses        231      217      -14     

Impacted Files	Coverage Δ
selene/schema/audits/fields.py	92.22% <92.36%> (-1.12%)	⬇️
selene/schema/__init__.py	99.23% <0.00%> (-0.01%)	⬇️
selene/schema/nvts/mutations.py
selene/schema/reports/fields.py	91.30% <0.00%> (+0.43%)	⬆️
selene/schema/cves/fields.py	85.52% <0.00%> (+12.94%)	⬆️

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