Remove FilterProviderInterface

[gsteel]

This interface is MVC Module Manager specific and does not belong in this library

See #204

[froschdesign]

The documentation must also be removed:

laminas-filter/docs/book/v3/application-integration/providing-filters-via-modules.md

Lines 1 to 16 in 08e0bb9

	# Providing Filters via Modules
	If you wish to indicate that your laminas-mvc module provides filters, have your `Module` class implement `Laminas\Filter\FilterProviderInterface`, which defines the method:
	```php
	/**
	* @return array
	*/
	public function getFilterConfig();
	```
	The method should return an array of configuration following the [laminas-servicemanager configuration format](https://docs.laminas.dev/laminas-servicemanager/configuring-the-service-manager/).
	If you are not using laminas-mvc, but are using a dependency injection container (e.g., if you are using Mezzio), you can also provide filters using the top-level `filters` configuration key; the value of that key should be laminas-servicemanager configuration, as linked above.
	(laminas-mvc users may also provide configuration in the same way, and omit implementation of the `FilterProviderInterface`.)

[gsteel]

The documentation must also be removed:

I've retained and updated the docs to point to the same interface in the Module Manager lib/docs

[froschdesign]

But doesn't this also apply to a config provider? What I mean by that is, wouldn't the interface also help the user in a config provider?