feat(*): use enums for consistency and speed (#5843)

Co-authored-by: Antonio Román <kyradiscord@gmail.com>

src/structures/TeamMember.js

@@ -29,7 +29,7 @@ class TeamMember extends Base {
 
     /**
      * The permissions this Team Member has with regard to the team
-     * @type {MembershipStates}
+     * @type {MembershipState}
      */
     this.membershipState = MembershipStates[data.membership_state];