[entity] add a new `cw_linkable_rql` method * the new method returns the entities that are or may be related to the current one by the relation passed as an argument. Closes #3738011.

if 'same_as' in schema:
    sync_schema_props_perms('same_as', syncperms=False)
sync_schema_props_perms('Bookmark', syncperms=False)