helper class/modules for wrapping promptable LLMs

[keighrim]

fix (partially) #263

[codecov]

Codecov Report

❌ Patch coverage is 60.59322% with 93 lines in your changes missing coverage. Please review.
✅ Project coverage is 63.85%. Comparing base (85ae527) to head (c2fed09).
⚠️ Report is 13 commits behind head on develop.

Files with missing lines	Patch %	Lines
clams/backends/hf.py	5.45%	52 Missing ⚠️
clams/app/__init__.py	79.54%	36 Missing ⚠️
clams/develop/__init__.py	0.00%	5 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #291      +/-   ##
===========================================
- Coverage    64.48%   63.85%   -0.64%     
===========================================
  Files            8        9       +1     
  Lines          887     1126     +239     
===========================================
+ Hits           572      719     +147     
- Misses         315      407      +92     

Flag	Coverage Δ
unittests	63.85% <60.59%> (-0.64%)	⬇️

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