Allow easy restriction of custom post types by adding new membership global settings

On the Membership settings page, display public post types with check boxes next to them and the following message "Select the post types that you would like to have the ability to restrict to membership level's on an individual basis" (or something similar)

The WP core post types "post" and "page" should selected by default.

Filter out reserved LLMS post types like courses, quizzes, lessons, certificates, groups, and achievements (these post types cannot be restricted to a membership so they should be explicitly excluded from the list of available post types that can be selected).

Add the restrict access metabox to post types selected here