Save initial camera state to update when websocket connects (#11174)

* Send camera state to dispatcher

* Fix logic

* Cleanup

* Send camera activitiy in on connect

* Support reading initial camera state

* Fix key

* Formatting

* Sorting

web/src/types/ws.ts

@@ -41,4 +41,15 @@ export interface FrigateEvent {
   after: FrigateObjectState;
 }
 
+export type ObjectType = {
+  id: string;
+  label: string;
+  stationary: boolean;
+};
+
+export interface FrigateCameraState {
+  motion: boolean;
+  objects: ObjectType[];
+}
+
 export type ToggleableSetting = "ON" | "OFF";