Facet by Meta Range block foundations

[felipeelia]

Description of the Change

This PR introduces the foundation of a Facet by Meta Range block.

It can be enabled adding the following snippet to a mu-plugin:

add_filter(
	'ep_facet_types',
	function ( $types ) {
		$types['meta-range'] = '\ElasticPress\Feature\Facets\Types\MetaRange\FacetType';
		return $types;
	}
);

Closes #3118

How to test the Change

Changelog Entry

Added - New Facet by Meta Range block

Credits

Props @felipeelia

Checklist:

• I agree to follow this project's Code of Conduct.
• I have updated the documentation accordingly.
• I have added tests to cover my change.
• All new and existing tests pass.