[Feat][Autoloader] Allow autoloading non-class files

[paulbalandan]

Description
This PR now allows Autoloader to load non-class files beside classes. This is similar to Composer's files array in composer.json. A user will now need to put the list of paths to the files in `Config\Autoload::$files`` and CI4 will autoload these on autoload registration.

Fixes #4447

Checklist:

• Securely signed commits
• Component(s) with PHPdocs
• Unit testing, with >80% coverage
• User guide updated
• Conforms to style guide

[MGatner]

Looks snazzy, and a fine PR. Might I ask what is the typical use case for such a feature?

[paulbalandan]

Looks snazzy, and a fine PR. Might I ask what is the typical use case for such a feature?

This is akin to composer's files autoloading where you can just include the paths to non-class files you want to include automatically.

[samsonasik]

Thank you @paulbalandan