Refactor event handling and update view rendering in HelloWorld

[souzadavi]

This pull request updates the example AzuraCast plugin to improve compatibility and code quality, modernize dependencies, and streamline event handling and view rendering. The most important changes are grouped below:

Dependency and Compatibility Updates:

• Added a PHP version requirement (>=8.2) to composer.json to ensure compatibility with newer PHP features.
• Removed the empty "require": {} block from composer.json for cleaner dependency management.

Event Handling and Routing Improvements:

• Updated event listeners in events.php:
  • Changed the view folder name from 'example' to 'ExamplePlugin' for consistency.
  • Simplified the route registration, using the HelloWorld controller directly and updating the route name to 'example:index'.
  • Commented out the subscriber registration for AllTheListeners to reduce noise in the example. [1] [2]

Controller and View Rendering Enhancements:

• Refactored the HelloWorld controller:
  • Injected the DI container and view as dependencies.
  • Updated the view template namespace from 'example::hello_world' to 'ExamplePlugin::hello_world'.

Template Update:

• Changed the layout in hello_world.phtml from 'minimal' to 'panel' for a more modern UI style.

Fixes issue:
Fix issue #8