feat(feature-activation): implement bit signaling service

[glevco]

Motivation

This PR implements the BitSignalingService as defined in this RFC.

Acceptance Criteria

• Add --signal-support and --signal-not-support CLI options
• Add Criteria.signal_support_by_default attribute
• Add FeatureState.get_signaling_states() method
• Implement BitSignalingService

Checklist

• If you are requesting a merge into master, confirm this code is production-ready and can be included in future releases as soon as it gets merged

[codecov]

Codecov Report

Merging #702 (9176efb) into master (779494c) will decrease coverage by 0.02%.
The diff coverage is 89.47%.

@@            Coverage Diff             @@
##           master     #702      +/-   ##
==========================================
- Coverage   84.00%   83.99%   -0.02%     
==========================================
  Files         246      247       +1     
  Lines       20517    20589      +72     
  Branches     2769     2779      +10     
==========================================
+ Hits        17236    17294      +58     
- Misses       2707     2716       +9     
- Partials      574      579       +5     

Impacted Files	Coverage Δ
hathor/feature_activation/bit_signaling_service.py	83.60% <83.60%> (ø)
hathor/feature_activation/feature.py	100.00% <100.00%> (ø)
hathor/feature_activation/model/criteria.py	100.00% <100.00%> (ø)
hathor/feature_activation/model/feature_state.py	100.00% <100.00%> (ø)
hathor/feature_activation/settings.py	100.00% <100.00%> (ø)

... and 3 files with indirect coverage changes

The base branch was changed.