Make it possible to pass arguments to partials

[johanmolen]

This way you can dynamically set the field name for example.

Examples:

->addPartials([
    Example::class => ['test' => 'value'],
    Whatever::class,
    Another::class => ['another' => 'value'],
])

->addPartial(IconSelect::class, [
    'field_name' => 'usp_icon',
])