Periphery cleanup (#5893)

ElementX/Sources/Services/Room/RoomMember/RoomMemberProxy.swift

@@ -56,6 +56,7 @@ final nonisolated class RoomMemberProxy: RoomMemberProxyProtocol {
         .init(rustPowerLevel: member.powerLevel)
     }
     
+    // periphery:ignore - might be useful to have
     var isServiceMember: Bool {
         member.isServiceMember
     }

ElementX/Sources/Services/Room/RoomMember/RoomMemberProxyProtocol.swift

@@ -26,6 +26,7 @@ nonisolated protocol RoomMemberProxyProtocol: AnyObject, Sendable {
     
     var powerLevel: RoomPowerLevel { get }
     
+    // periphery:ignore - might be useful to have
     var isServiceMember: Bool { get }
 }