allow fk field filtering python style

[Abdeldjalil-H]

I have edited the FieldAccessor._check_field method to allow foreign keys filtering in python style. More details about this in #846

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (52d992d) to head (bd6b7fe).
Report is 1 commits behind head on master.

❗ Current head bd6b7fe differs from pull request most recent head d9f74d9. Consider uploading reports for the commit d9f74d9 to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##            master      #854     +/-   ##
===========================================
  Coverage   100.00%   100.00%             
===========================================
  Files          203       188     -15     
  Lines        14791     16833   +2042     
===========================================
+ Hits         14791     16833   +2042     

Files	Coverage Δ
ormar/queryset/field_accessor.py	100.00% <100.00%> (ø)
tests/test_model_definition/test_fields_access.py	100.00% <100.00%> (ø)

... and 181 files with indirect coverage changes

[codspeed-hq]

CodSpeed Performance Report

Merging #854 will degrade performances by 13.74%

_{Comparing Abdeldjalil-H:master (d9f74d9) with master (5f4354d)}

Summary

⚡ 2 improvements
❌ 1 regressions
✅ 81 untouched benchmarks

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	master	Abdeldjalil-H:master	Change
⚡	test_max[1000]	15.6 ms	13.7 ms	+13.26%
❌	test_exists[250]	11.9 ms	13.8 ms	-13.74%
⚡	test_get_or_none[1000]	14.1 ms	12.3 ms	+14.56%