Make the field widget configurable with file extensions

[colorfield]

The Frontify finder can be filtered by extensions in

frontify/js/frontify_entity_form.js

Lines 39 to 52 in 9481b2b

	values: [
	//'ai',
	//'bmp',
	//'eps',
	'gif',
	//'heif',
	'jpeg',
	'jpg',
	'png',
	'svg',
	//'tif',
	'tiff',
	'webp',
	],

This is currently hardcoded to images, this was ported as is from 2.x branch of the module.

A first approach to limit the extensions would be in a Media provider as e.g. third party settings. But this doesn't make it very portable.

A better approach, that is entity type agnostic is to configure it on the field widget.
In that case, it's perfectly valid to e.g. use the Frontify field outside of a Media context.
Example use case: a taxonomy term with svg icons that doesn't need any other Frontify fields as it's just decorative.