[WIP] Enforce protocol settings at instantiation

[ianmkenney]

Require Protocol authors to define the _settings_cls attribute for their class. init method checks that _settings_cls is define (if not raise NotImplementedError) and that the passed settings are an instance of the _settings_cls (if not raise ValueError).

Update existing Protocols in gufe to reflect this change. Closes #405.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.52%. Comparing base (f8baf7f) to head (af742cf).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #461   +/-   ##
=======================================
  Coverage   98.52%   98.52%           
=======================================
  Files          39       39           
  Lines        2166     2170    +4     
=======================================
+ Hits         2134     2138    +4     
  Misses         32       32           

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