Lists all group memberships of a site member.
The listMemberships() function returns a Promise that resolves to a list of up to 100 group memberships.
Sorts by default to groupId in descending order.
Notes:
suppressAuth option is set to true, all permissions are overwritten, and all site members (including non-group members) can see a list of a site member's memberships.null as a placeholder for any unspecified parameters. For example, to specify limit only, call listMemberships(memberId, paging, null). To specify supressAuth only, call listMemberships(memberId, null, options).Site member ID.
Paging options.
Authorization options.