Add $lib.model.ext.getExtModel and $lib.model.ext.addExtModel APIS (SYN-5228)

[vEpiphyte]

No description provided.

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.10 ⚠️

Comparison is base (6c78faa) 97.31% compared to head (d28096b) 97.21%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3252      +/-   ##
==========================================
- Coverage   97.31%   97.21%   -0.10%     
==========================================
  Files         226      226              
  Lines       45254    45327      +73     
==========================================
+ Hits        44038    44065      +27     
- Misses       1216     1262      +46     

Flag	Coverage Δ
linux	97.21% <100.00%> (+<0.01%)	⬆️
linux_replay	?

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Impacted Files	Coverage Δ
synapse/cortex.py	96.98% <100.00%> (-0.45%)	⬇️
synapse/lib/stormlib/modelext.py	100.00% <100.00%> (ø)

... and 8 files with indirect coverage changes

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