Add support for sending media within threads.

This patch add the `threadRootEventID` as a parameter to media sending functions and forwards the timeline thread root between various application states to the place where its needed.
The 2 missing items are Locations and Polls which currently don't have any support on the Rust side for being sent within threads. That will come in a separate PR.

ElementX/Sources/Screens/Timeline/TimelineInteractionHandler.swift

@@ -362,7 +362,9 @@ class TimelineInteractionHandler {
 
         actionsSubject.send(.composer(action: .setMode(mode: .previewVoiceMessage(state: audioPlayerState, waveform: .url(recordingURL), isUploading: true))))
         await voiceMessageRecorder.stopPlayback()
-        switch await voiceMessageRecorder.sendVoiceMessage(inRoom: roomProxy, audioConverter: AudioConverter()) {
+        switch await voiceMessageRecorder.sendVoiceMessage(inRoom: roomProxy,
+                                                           audioConverter: AudioConverter(),
+                                                           threadRootEventID: timelineController.timelineKind.threadRootEventID) {
         case .success:
             await deleteCurrentVoiceMessage()
         case .failure(let error):