feat(feature-activation): add feature settings validation

[glevco]

Motivation

This PR implements a validation that compares the Feature Activation settings from the configuration file, against the previous value that is stored in the database. This runs during full node initialization and is just to prevent human errors when editing those files, since one cannot remove or change existing features from there.

Acceptance Criteria

• Create new FeatureActivationStorage that validates configured feature activation settings against the previous value from the database.
• Add new reset-feature-settings CLI tool for erasing saved feature settings.

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

Attention: Patch coverage is 80.95238% with 12 lines in your changes are missing coverage. Please review.

Project coverage is 85.13%. Comparing base (b1e8d35) to head (2446dd2).

Files	Patch %	Lines
...e_activation/storage/feature_activation_storage.py	78.72%	7 Missing and 3 partials ⚠️
hathor/builder/builder.py	75.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #894      +/-   ##
==========================================
+ Coverage   85.10%   85.13%   +0.02%     
==========================================
  Files         293      294       +1     
  Lines       22719    22781      +62     
  Branches     3418     3426       +8     
==========================================
+ Hits        19335    19394      +59     
- Misses       2705     2706       +1     
- Partials      679      681       +2     

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