Taxonomy regular expression comparator cmpr is busted (SYN-5644)

[ghost]

• Removed value norming in synapse.lib.types.Type.cmpr method so regex patterns don't get normed to the target type.
• Add tests to check the regex matching logic.

Fixes SYN-5644

[codecov]

Codecov Report

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

Comparison is base (dec6ac1) 97.30% compared to head (e97dadc) 97.20%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3213      +/-   ##
==========================================
- Coverage   97.30%   97.20%   -0.11%     
==========================================
  Files         224      224              
  Lines       44966    44967       +1     
==========================================
- Hits        43756    43709      -47     
- Misses       1210     1258      +48     

Flag	Coverage Δ
linux	97.20% <100.00%> (-0.01%)	⬇️
linux_replay	?

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Impacted Files	Coverage Δ
synapse/lib/types.py	97.63% <100.00%> (+<0.01%)	⬆️

... and 10 files with indirect coverage changes

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