Adding group properties

[TheBurchLog]

Adding support to label Plugins with the Group tag

[codecov]

Codecov Report

Attention: 9 lines in your changes are missing coverage. Please review.

Comparison is base (95d48b6) 92.39% compared to head (7c9d6fd) 92.25%.
Report is 10 commits behind head on develop.

Files	Patch %	Lines
brewtils/models.py	50.00%	5 Missing ⚠️
brewtils/decorators.py	83.33%	3 Missing ⚠️
brewtils/rest/easy_client.py	75.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #430      +/-   ##
===========================================
- Coverage    92.39%   92.25%   -0.15%     
===========================================
  Files           28       28              
  Lines         3644     3681      +37     
===========================================
+ Hits          3367     3396      +29     
- Misses         277      285       +8     

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