RDS: Proxy Target Groups

[bblommers]

Fixes #8159

[codecov]

Codecov Report

Attention: Patch coverage is 97.67442% with 3 lines in your changes missing coverage. Please review.

Project coverage is 94.55%. Comparing base (1ace1db) to head (ea85e51).
Report is 14 commits behind head on master.

Files with missing lines	Patch %	Lines
moto/rds/models.py	96.51%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8237      +/-   ##
==========================================
+ Coverage   94.54%   94.55%   +0.01%     
==========================================
  Files        1158     1158              
  Lines      100089   100251     +162     
==========================================
+ Hits        94629    94794     +165     
+ Misses       5460     5457       -3     

Flag	Coverage Δ
servertests	28.87% <27.90%> (-0.01%)	⬇️
unittests	94.52% <97.67%> (+0.01%)	⬆️

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