Allows Secret groups to be optional and configurable

[thomasjpfan]

Why are the changes needed?

This PR enables third party configuration plugins to disable the groups when specifying secrets.

What changes were proposed in this pull request?

This PR adds secret_requires_group to the Plugin Configuration API. This allows plugins to disable groups for specifying secrets.

For this to work, the external configuration plugin needs to be installed locally and on the remote machine.

How was this patch tested?

Unit tests were added to check that secret groups can be disabled through with the Plugin Configuration API.

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (fccf7c7) 86.05% compared to head (8fdb32c) 86.06%.

Files	Patch %	Lines
flytekit/models/security.py	66.66%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2062      +/-   ##
==========================================
+ Coverage   86.05%   86.06%   +0.01%     
==========================================
  Files         313      313              
  Lines       23344    23351       +7     
  Branches     3489     3491       +2     
==========================================
+ Hits        20088    20097       +9     
+ Misses       2644     2643       -1     
+ Partials      612      611       -1     

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