Add PEP691 Format support

[cooperlees]

• Move to 6.0.0.dev0 version
• Add config for setting formats to save to storage
  • simple-format
  • Valid options: ALL, HTML or JSON
• Move mirror simple generation functions to new simple module
• Add new tests to test_simple.py
  • Made tests be included with install by adding an init.py

Tests

• Add unittest coverage to SimpleAPI object
  • Test valid and invalid format requests
  • Test the JSON output for PEP691 compliance
    • Per pacakge
    • Global index
• Add check to Integration test to expect json index ...

[codecov]

Codecov Report

Merging #1154 (f2c1ddf) into main (c78e7da) will increase coverage by 4.01%.
The diff coverage is 92.43%.

@@            Coverage Diff             @@
##             main    #1154      +/-   ##
==========================================
+ Coverage   79.36%   83.38%   +4.01%     
==========================================
  Files          16       31      +15     
  Lines        2641     4218    +1577     
  Branches      493      662     +169     
==========================================
+ Hits         2096     3517    +1421     
- Misses        387      523     +136     
- Partials      158      178      +20     

Impacted Files	Coverage Δ
src/bandersnatch/__init__.py	100.00% <ø> (ø)
src/bandersnatch/tests/conftest.py	96.46% <ø> (ø)
src/bandersnatch/tests/test_sync.py	100.00% <ø> (ø)
src/bandersnatch/mirror.py	81.96% <85.00%> (-1.35%)	⬇️
src/bandersnatch/simple.py	89.84% <89.84%> (ø)
src/bandersnatch/configuration.py	86.99% <100.00%> (+0.78%)	⬆️
src/bandersnatch/tests/test_configuration.py	96.51% <100.00%> (ø)
src/bandersnatch/tests/test_filter.py	89.88% <100.00%> (ø)
src/bandersnatch/tests/test_main.py	96.55% <100.00%> (ø)
src/bandersnatch/tests/test_mirror.py	96.65% <100.00%> (ø)
... and 15 more

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