Step Function - Add support for State Machine to resourcegrouptaggingapi

[zkarpinski]

resolves #8212

[codecov]

Codecov Report

Attention: Patch coverage is 90.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 94.53%. Comparing base (43410b9) to head (c2cc710).
Report is 8 commits behind head on master.

Files with missing lines	Patch %	Lines
moto/resourcegroupstaggingapi/models.py	90.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8215      +/-   ##
==========================================
- Coverage   94.53%   94.53%   -0.01%     
==========================================
  Files        1155     1157       +2     
  Lines       99707    99941     +234     
==========================================
+ Hits        94261    94481     +220     
- Misses       5446     5460      +14     

Flag	Coverage Δ
servertests	28.81% <60.00%> (-0.04%)	⬇️
unittests	94.50% <90.00%> (-0.01%)	⬇️

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[bblommers]

LGTM!