feat(model): add support for half-precision

[fardeon]

Tested on Google Colab with THUDM/chatglm-6b.

[codecov-commenter]

Codecov Report

Patch coverage: 66.66% and project coverage change: -0.28 ⚠️

Comparison is base (8477673) 95.45% compared to head (7d410cd) 95.17%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master      #45      +/-   ##
==========================================
- Coverage   95.45%   95.17%   -0.28%     
==========================================
  Files           7        7              
  Lines         308      311       +3     
==========================================
+ Hits          294      296       +2     
- Misses         14       15       +1     

Impacted Files	Coverage Δ
basaran/model.py	90.96% <50.00%> (-0.54%)	⬇️
basaran/__init__.py	96.15% <100.00%> (+0.15%)	⬆️

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