Add support for Filament v4 and v5

[howdu]

This pull request introduces significant updates to improve compatibility, streamline development workflows, and enhance the UI for the Filament Clear Cache plugin. The main changes include adding support for newer PHP, Laravel, and Filament versions, updating dependencies, improving the GitHub Actions workflow, and refactoring the cache clear button UI. Additionally, there are updates to testing practices and documentation.

Compatibility and Dependency Updates:

• Expanded support to PHP 8.2+, Laravel 11/12, and Filament 4.x/5.x by updating the composer.json requirements and reflecting these changes in the compatibility table in README.md. [1] [2]
• Updated development dependencies for Pest, Testbench, and Larastan, and modernized composer scripts for linting and testing. [1] [2]

CI/CD and Workflow Improvements:

• Enhanced the GitHub Actions workflow to test against PHP 8.1–8.5, Laravel 10–12, and Filament 4–5, including caching Composer dependencies and validating composer files for stricter CI. [1] [2]
• Added a backup workflow file .github/workflows/run-tests.yml.bak for reference.

UI/UX Enhancements:

• Refactored the cache clear button to use Filament's icon-button component, improved loading indicators, and updated the badge display for cache count.

Codebase and Internal Refactoring:

• Updated the plugin version to 3.0.0 and refactored registration logic for Livewire v3+ compatibility, including dynamic component registration and namespace handling. [1] [2]
• Cleaned up test setup by removing redundant user creation and actingAs logic from the test case base class, moving it into individual tests. [1] [2] [3] [4]

Documentation and Configuration:

• Updated the compatibility matrix and usage instructions in README.md to reflect new version support and Livewire v3+ event dispatching. [1] [2]
• Minor improvements to composer.json keywords and configuration.
• Adjusted phpstan.neon.dist to include the config directory for static analysis.