Add nested input_filter for field descriptor

[LeanderCS]

Summary by Bito

This pull request enhances the Flask input filter library by introducing nested validation capabilities through an 'input_filter' attribute. It includes updates to documentation and a changelog, as well as a comprehensive suite of tests to ensure robust validation across various scenarios.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[Copilot]

Pull Request Overview

This PR adds support for nested InputFilter validation, allowing fields to validate nested dictionary structures by specifying an InputFilter class via the input_filter parameter in the field() decorator.

Key Changes:

• Added input_filter parameter to field descriptors and models to enable nested validation
• Implemented nested validation logic in ValidationMixin with type checking and error propagation
• Added comprehensive test coverage for various nested validation scenarios

Reviewed Changes

Copilot reviewed 18 out of 19 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
tests/input_filter/test_nested_input_filter.py	New comprehensive test suite for nested InputFilter validation with 20+ test cases
pyproject.toml	Version bump from 0.7.4 to 0.7.5
flask_inputfilter/models/field_model/field_model.py	Added input_filter attribute to FieldModel dataclass
flask_inputfilter/models/field_model/_field_model.pyx	Added input_filter parameter to Cython FieldModel implementation
flask_inputfilter/models/field_model/_field_model.pxd	Added input_filter declaration to Cython header
flask_inputfilter/mixins/validation_mixin/validation_mixin.py	Implemented nested validation logic with apply_nested_input_filter method
flask_inputfilter/mixins/validation_mixin/_validation_mixin.pyx	Cython implementation of nested validation logic
flask_inputfilter/mixins/validation_mixin/_validation_mixin.pxd	Added Cython declaration for nested validation method
flask_inputfilter/input_filter.py	Updated to pass input_filter parameter during field registration
flask_inputfilter/declarative/field_descriptor.pyi	Added input_filter type hint to field descriptor stub
flask_inputfilter/declarative/field_descriptor.py	Added input_filter parameter to FieldDescriptor class
flask_inputfilter/declarative/field.py	Added input_filter parameter to field() function with documentation
flask_inputfilter/declarative/_field_descriptor.pyx	Added input_filter to Cython FieldDescriptor implementation
flask_inputfilter/declarative/_field_descriptor.pxd	Added input_filter declaration to Cython header
flask_inputfilter/_input_filter.pyx	Updated Cython InputFilter to pass input_filter parameter
docs/source/options/global_decorators.rst	Removed unrelated hierarchical configuration documentation
docs/source/options/field_decorator.rst	Added comprehensive documentation for the new input_filter parameter
docs/source/changelog.rst	Added changelog entry for version 0.7.5 with nested InputFilter feature

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