Always toprim Storm Dict keys (SYN-5288)

[mikemoritz]

• Also checks that the key is not mutable

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.11 ⚠️

Comparison is base (361ac02) 97.30% compared to head (a5bbc39) 97.20%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3233      +/-   ##
==========================================
- Coverage   97.30%   97.20%   -0.11%     
==========================================
  Files         226      226              
  Lines       45152    45174      +22     
==========================================
- Hits        43936    43912      -24     
- Misses       1216     1262      +46     

Flag	Coverage Δ
linux	97.20% <100.00%> (+<0.01%)	⬆️
linux_replay	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
synapse/lib/ast.py	98.93% <100.00%> (+<0.01%)	⬆️
synapse/lib/stormtypes.py	98.73% <100.00%> (+<0.01%)	⬆️

... and 9 files with indirect coverage changes

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