Update utils file

[KengoWada]

Resolves #52

Proposed changes

• Updated the Exceptions to more exact Exceptions.
• Added custom exceptions BatchUpdateError, UnorderedQuerySetError
• Fixed objs to objects
• Added model factories to make creating test objects easier
• Added factory-boy to dev dependencies
• Updated utils docstrings for uniformity following numpydoc style.

Types of changes

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Put an x in the boxes that apply

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update (if none of the other choices apply)

Checklist

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• I have read the CONTRIBUTING doc
• Lint and unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)
• Any dependent changes have been merged and published in downstream modules

[KengoWada]

@EricOuma please review this. Thanks

[codecov-commenter]

Codecov Report

Attention: 5 lines in your changes are missing coverage. Please review.

Comparison is base (6e79c21) 71.75% compared to head (1959c5a) 79.50%.

❗ Current head 1959c5a differs from pull request most recent head 4d03d8c. Consider uploading reports for the commit 4d03d8c to get more accurate results

Files	Patch %	Lines
django_typesense/admin.py	16.66%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #58      +/-   ##
==========================================
+ Coverage   71.75%   79.50%   +7.75%     
==========================================
  Files          11       12       +1     
  Lines         563      571       +8     
==========================================
+ Hits          404      454      +50     
+ Misses        159      117      -42     

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[EricOuma]

Hello @KengoWada. I've been busy on other stuff. There is an urgent fix I needed to make on main. Please look into the conflicts.

[KengoWada]

@EricOuma done. Please review. Thanks