Deferred fields patch

[JordanHyatt]

Description

Provided a patch that allows objects to be deleted when they have deferred fields present

Related Issue

This is related to issue #678

Motivation and Context

This allows users of simple_history to delete objects without having to consider the consequences of deferring fields in their query

Types of changes

• Bug fix (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 change)

Checklist:

• I have run the pre-commit run command to format and lint.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• I have added my name and/or github handle to AUTHORS.rst
• I have added my change to CHANGES.rst
• All new and existing tests passed.

[JordanHyatt]

I wanted to work on a new feature so I needed to branch my fork and re-submit this PR

[tim-schilling]

Thanks for the PR @JordanHyatt. I apologize for taking so long to get to this. I think once it's cleaned up, it's an easy thing for us to merge in.

[JordanHyatt]

All requested changes have been pushed! (except for maybe the signals.rst issue?)

[tim-schilling]

Thank you for your help!

[JordanHyatt]

@tim-schilling sorry I added in a last second piece of logic that will skip loading the fields if its not a history enabled model.

[codecov]

Codecov Report

Attention: Patch coverage is 83.33333% with 2 lines in your changes missing coverage. Please review.

Project coverage is 96.73%. Comparing base (4a8756a) to head (b01aeac).
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
simple_history/models.py	83.33%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1393      +/-   ##
==========================================
- Coverage   96.81%   96.73%   -0.09%     
==========================================
  Files          24       24              
  Lines        1446     1470      +24     
  Branches      236      240       +4     
==========================================
+ Hits         1400     1422      +22     
  Misses         25       25              
- Partials       21       23       +2     

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• Flaky Tests Detection - Detect and resolve failed and flaky tests

[JordanHyatt]

I think we are about there, let me know what you think @tim-schilling!

[tim-schilling]

Thank you!