Multi-api-mocker

Added
- Support for handling exceptions in the mock API responses for `httpx`.

Changed
- Supporting both class and instance types for `default_exc` in `MockAPIResponse`.

Added
- Added support for `httpx`.
- Deprecated `setup_api_mocks` fixture in favor of the new `setup_http_mocks`.

Added
- Implementing matchers in the MockSet class to enhance the tracking and management of multiple mock responses in tests.

Added
- Initial release of `multi_api_mocker`.
- Core functionality for creating and managing mock API responses with `MockAPIResponse` class.
- `MockSet` class for efficient access and management of multiple mock responses.
- Pytest fixture `setup_api_mocks` for easy integration and setup of mock responses in tests.
- Example subclasses for common API interactions such as `Commit`, `Fork`, `Push`, and `ForcePush`.
- Comprehensive test suite demonstrating usage of the library in various scenarios.
- Documentation for each component, detailing usage, examples, and integration steps.
- GitHub Actions workflow for automated testing and PyPI deployment.
- Pre-commit hooks configuration for code formatting and linting.