Add a filter to allow extending supported post types

Hello,

The plugin currently hardcodes the supported post types in OBJECT_TYPES at components/ads/class-main.php:

const OBJECT_TYPES = array( 'page', 'post' );

This constant gates:

• The “Raptive Ads” CMB2 metabox registration (line 214)
• The per-post admin-ads override in admin_ads_disabled() (line 459)

Sites that publish ad-supported content under custom post types (CPTs) currently have no supported way to extend this list. Editing the plugin file directly works but gets wiped on every plugin update.

Request: Could you wrap OBJECT_TYPES in a filter, e.g.:

$object_types = apply_filters( 'adthrive_ads_object_types', self::OBJECT_TYPES );

…and use $object_types in place of self::OBJECT_TYPES in the three usages. That would let us register the metabox on our CPTs from a theme or mu-plugin without modifying plugin files.

thanks!