add model factory

[jonykalavera]

WIP to retrieve a model instance from the avsc file path.

#37

[ffinfo]

@jonykalavera Nice change to add this. Can you add some testing for this to be sure that this stays working?

[codecov-commenter]

Codecov Report

Merging #36 (c7d1628) into main (5388e41) will decrease coverage by 2.89%.
The diff coverage is 14.28%.

@@            Coverage Diff             @@
##             main      #36      +/-   ##
==========================================
- Coverage   89.08%   86.18%   -2.90%     
==========================================
  Files           2        2              
  Lines         174      181       +7     
==========================================
+ Hits          155      156       +1     
- Misses         19       25       +6     

Impacted Files	Coverage Δ
src/pydantic_avro/avro_to_pydantic.py	77.77% <14.28%> (-4.84%)	⬇️

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