Perform dead code analysis with Knip (#2575)

* Install Knip

* Clarify an import that was confusing Knip

* Fix issues detected by Knip

Including cleaning up some unused code and dependencies, using a React hook that we unintentionally stopped using, and also adding some previously undeclared dependencies.

* Run dead code analysis in lint script and CI

---------

Co-authored-by: Timo <toger5@hotmail.de>

src/useEvents.ts

@@ -15,7 +15,6 @@ limitations under the License.
 */
 
 import { useEffect } from "react";
-import EventEmitter, { EventMap } from "typed-emitter";
 
 import type {
   Listener,
@@ -60,20 +59,3 @@ export function useTypedEventEmitter<
     };
   }, [emitter, eventType, listener]);
 }
-
-// Shortcut for registering a listener on an eventemitter3 EventEmitter (ie. what the LiveKit SDK uses)
-export function useEventEmitterThree<
-  EventType extends keyof T,
-  T extends EventMap,
->(
-  emitter: EventEmitter<T>,
-  eventType: EventType,
-  listener: T[EventType],
-): void {
-  useEffect(() => {
-    emitter.on(eventType, listener);
-    return (): void => {
-      emitter.off(eventType, listener);
-    };
-  }, [emitter, eventType, listener]);
-}