Add tests for model mixin

[KengoWada]

Resolves #25

Added tests for TypesenseModelMixin

Changes made

• Added test settings
• Added test models and collections
• Added Django test runner
• Fixed TypesenseCollection delete method to convert object ids to int
• Updated CONTRIBUTIONS.md to reflect changes in tests.
• Updated GitHub actions to include TypeSense

[codecov-commenter]

Codecov Report

Attention: 17 lines in your changes are missing coverage. Please review.

Comparison is base (cf788bd) 100.00% compared to head (e0bd091) 60.36%.

Additional details and impacted files

@@             Coverage Diff              @@
##              main      #29       +/-   ##
============================================
- Coverage   100.00%   60.36%   -39.64%     
============================================
  Files            1       10        +9     
  Lines           12      439      +427     
============================================
+ Hits            12      265      +253     
- Misses           0      174      +174     

Files	Coverage Δ
django_typesense/collections.py	55.97% <60.46%> (ø)

... and 9 files with indirect coverage changes

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[EricOuma]

Some of the skeleton code I added for the tests are slightly obsolete. The tests you have added are actually for test_typesense_collection and not test_typesense_model_mixin

[KengoWada]

Some of the skeleton code I added for the tests are slightly obsolete. The tests you have added are actually for test_typesense_collection and not test_typesense_model_mixin

Hey @EricOuma noted. I've updated the tests to target django_typesense.mixins