Feature: add new q filter interface

[OdysseyJ]

Summary

Add new custom filtering Interface related issue #399

@strawberry_django.filters.filter(models.Fruit)
class QFilter:
    search: Optional[str]

    def q_search(self, value: str) -> Q:
        return Q(name=value)

usage.

### Fruits = ["strawberry", "raspberry", "banana"]
def test_q_filter_method_with_nested_not_filter(query, fruits):
    result = query(
        '{ fruits: qFilter(filters: { NOT : { search: "strawberry" }}) { id name } }'
    )
    assert result.data["fruits"] == [
        {"id": "2", "name": "raspberry"},
        {"id": "3", "name": "banana"},
    ]

Description

In my project, i implement many custom filters. Now, custom filters not working with NOT, AND, OR This change allow user using custom filter with NOT, AND, OR and user don't have to change custom filter_{} method.

Q() style filters are used in other projects also. https://django-ninja.dev/guides/input/filtering/

Types of Changes

• [ ] Core
• [ ] Bugfix
• [x] New feature
• [ ] Enhancement/optimization
• [x] Documentation

Issues Fixed or Closed by This PR

*

Checklist

• [x] My code follows the code style of this project.
• [x] My change requires a change to the documentation.
• [x] I have updated the documentation accordingly.
• [x] I have read the CONTRIBUTING document.
• [x] I have added tests to cover my changes.
• [x] I have tested the changes and verified that they work and don't break anything (as well as I can manage).

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (433ceeb) 87.73% compared to head (d4006e8) 87.74%. Report is 8 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #451 +/- ## ========================================== + Coverage 87.73% 87.74% +0.01% ========================================== Files 37 37 Lines 3130 3150 +20 ========================================== + Hits 2746 2764 +18 - Misses 384 386 +2 ```

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[bellini666]

Hey @OdysseyJ ,

This seems nice! Can we have a small example in the docs, similar to the custom filter ones?

[OdysseyJ]

Hi @bellini666 Thanks for reading my PR. Sure. I will do it.

[OdysseyJ]

@bellini666 finished.