fix(optimizer): Convert select_related into Prefetch when the type defines a custom get_queryset

[bellini666]

Fix #572 Initial resolution for #549

Summary by Sourcery

This pull request addresses a bug where select_related was not respecting custom get_queryset methods by converting them into Prefetch. It also introduces a helper function to streamline type retrieval and updates the optimizer to avoid optimizing fields with a base resolver unless auto-generated. Additionally, a new test was added to verify the fallback behavior.

• Bug Fixes:
  • Fixed an issue where select_related was not respecting custom get_queryset methods by converting them into Prefetch.
• Enhancements:
  • Introduced a helper function _get_django_type to streamline the retrieval of Django types from Strawberry fields.
  • Updated the optimizer to avoid optimizing fields with a base resolver unless they are auto-generated by the system.
• Tests:
  • Added a test to ensure select_related falls back to Prefetch when the type defines a custom get_queryset method.

[sourcery-ai[bot]]

Reviewer's Guide by Sourcery

This pull request addresses issue #572 by refactoring the optimizer to convert select_related into Prefetch when the type defines a custom get_queryset. Key changes include the introduction of a helper function to resolve Django types, updates to the optimizer logic, and the addition of new tests to verify the behavior.

File-Level Changes

Files	Changes
strawberry_django/optimizer.py strawberry_django/fields/field.py	Refactored optimizer to use Prefetch when a custom get_queryset is defined and added optimization flag to default_resolver.
tests/test_optimizer.py tests/projects/schema.py	Added tests to verify the new Prefetch behavior and updated schema definitions accordingly.

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 88.88889% with 2 lines in your changes missing coverage. Please review.

Project coverage is 88.90%. Comparing base (3aa993a) to head (538dbe5).

Files	Patch %	Lines
strawberry_django/optimizer.py	88.23%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #583 +/- ## ========================================== + Coverage 88.87% 88.90% +0.03% ========================================== Files 41 41 Lines 3585 3595 +10 ========================================== + Hits 3186 3196 +10 Misses 399 399 ```

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