Greengrass Implement subscription_definition APIs

[cm-iwata]

Implement these APIs

• create_subscription_definition
• list_subscription_definitions
• get_subscription_definition
• delete_subscription_definition
• update_subscription_definition
• create_subscription_definition_version
• list_subscription_definition_versions
• get_subscription_definition_version

[codecov-commenter]

Codecov Report

Merging #5240 (7f543ce) into master (a44a9df) will increase coverage by 0.00%.
The diff coverage is 98.72%.

@@           Coverage Diff            @@
##           master    #5240    +/-   ##
========================================
  Coverage   95.86%   95.87%            
========================================
  Files         688      688            
  Lines       68269    68426   +157     
========================================
+ Hits        65448    65603   +155     
- Misses       2821     2823     +2     

Flag	Coverage Δ
servertests	36.32% <12.10%> (-0.06%)	⬇️
unittests	95.81% <98.72%> (+<0.01%)	⬆️

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Impacted Files	Coverage Δ
moto/greengrass/urls.py	100.00% <ø> (ø)
moto/greengrass/models.py	99.02% <97.93%> (-0.34%)	⬇️
moto/greengrass/responses.py	100.00% <100.00%> (ø)

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[bblommers]

LGTM! Thanks @cm-iwata

[github-actions]

This is now part of moto >= 3.1.14.dev16