feat(client): add root support for filtering by None

[RobertCraigie]

Change Summary

Closes #331.

I've only added root support for querying by None as adding that to sub filters is a much bigger task.

Checklist

• Unit tests for the changes exist
• Tests pass without significant drop in coverage
• Documentation reflects changes where applicable
• Test snapshots have been updated if applicable

Agreement

By submitting this pull request, I confirm that you can use, modify, copy and redistribute this contribution, under the terms of your choice.

[codecov]

Codecov Report

Merging #362 (0dce5f8) into main (59847ca) will increase coverage by 0.06%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #362      +/-   ##
==========================================
+ Coverage   96.52%   96.58%   +0.06%     
==========================================
  Files         113      113              
  Lines        5639     5747     +108     
  Branches      324      325       +1     
==========================================
+ Hits         5443     5551     +108     
  Misses        147      147              
  Partials       49       49              

Impacted Files	Coverage Δ
src/prisma/generator/models.py	91.96% <100.00%> (+0.03%)	⬆️
tests/test_types/test_bigint.py	100.00% <100.00%> (ø)
tests/test_types/test_bool.py	100.00% <100.00%> (ø)
tests/test_types/test_bytes.py	100.00% <100.00%> (ø)
tests/test_types/test_datetime.py	100.00% <100.00%> (ø)
tests/test_types/test_decimal.py	100.00% <100.00%> (ø)
tests/test_types/test_float.py	100.00% <100.00%> (ø)
tests/test_types/test_int.py	100.00% <100.00%> (ø)
tests/test_types/test_string.py	100.00% <100.00%> (ø)

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