ios: native WebRTC (#1933)

* ios: native WebRTC

* add video showing

* make async function better working with main thread

* wrapped code in main actor, just in case

* small change

* a little better

* enable relay

* removed unused code

* allow switching calls

* testing

* enable encryption

* testing more

* another test

* one more test

* fix remote unencrypted video

* deleted unused code related to PixelBuffer

* added MediaEncryption playground

* better playground

* better playground

* fixes

* use new encryption api

* media encryption works

* small changes

* added lib dependency

* use commit reference for lib instead of version

* video format, PIP size

* remove sample.js

---------

Co-authored-by: Evgeny Poberezkin <2769109+epoberezkin@users.noreply.github.com>

apps/ios/Shared/Model/SimpleXAPI.swift

@@ -1224,7 +1224,6 @@ func processReceivedMsg(_ res: ChatResponse) async {
                     offer: offer.rtcSession,
                     iceCandidates: offer.rtcIceCandidates,
                     media: callType.media, aesKey: sharedKey,
-                    useWorker: true,
                     iceServers: iceServers,
                     relay: useRelay
                 )