Ability to adjust remove_wp_meta_box per post type

By default, ACF hides the custom posts metabox. You can reenable it like so:

add_filter( 'acf/settings/remove_wp_meta_box', '__return_false' );

However, this turns it on or off for all post and all post types. If you attempt to enable it for a specific post type:

add_action( 'wp', function() {
	if ( 'sample-cpt' === get_post_type() ) {
		// Show custom fields boxes, even when ACF is installed
		add_filter( 'acf/settings/remove_wp_meta_box', '__return_false' );
	}
});

This will fail as the wp hook happens after ACF has already initialized.

It would be helpful if you allowed the custom posts metabox to be enabled/disable at a later point in the action-firing sequence.

Start by tracing the acf/settings/remove_wp_meta_box filter through ACF initialization and the WordPress wp hook described in the issue. Determine where the setting is evaluated and how post types are available at that point. Done means the custom posts metabox can be enabled or disabled per post type after the relevant action sequence, without changing behavior for other post types.