Refract/cleanup - Added Test suite / formating etc.

[use-the-fork]

This commit introduces several new features and improvements to the package:

• Nix Integration: Includes formatters, pre-commit hooks, and general environment setup.
• Orchestra/Testbench: Integrates Testbench into the package.
• Seeders and Factories Conversion: Converts all seeders and factories from laravel-elasticsearch-tests.
• Base Testing Suite: Creates a base testing suite based on the site documentation.
• Independent Tests: Modifies all tests to run 100% independently of each other (tests should never rely on each other).
• GitHub Action for CI/CD: Adds a GitHub action to test for CI/CD (this will need further work but needs to be merged first).

There is definitely work to be done with coverage but in general this is a solid foundation: