Reduce API of JoinedRoom, caller must use the Timeline API from liveTimeline instead. (#4731)

This removes lots of boilerplate code.

features/poll/impl/src/main/kotlin/io/element/android/features/poll/impl/actions/DefaultEndPollAction.kt

@@ -22,7 +22,7 @@ class DefaultEndPollAction @Inject constructor(
     private val analyticsService: AnalyticsService,
 ) : EndPollAction {
     override suspend fun execute(pollStartId: EventId): Result<Unit> {
-        return room.endPoll(
+        return room.liveTimeline.endPoll(
             pollStartId = pollStartId,
             text = "The poll with event id: $pollStartId has ended."
         ).onSuccess {

features/poll/impl/src/main/kotlin/io/element/android/features/poll/impl/actions/DefaultSendPollResponseAction.kt

@@ -22,7 +22,7 @@ class DefaultSendPollResponseAction @Inject constructor(
     private val analyticsService: AnalyticsService,
 ) : SendPollResponseAction {
     override suspend fun execute(pollStartId: EventId, answerId: String): Result<Unit> {
-        return room.sendPollResponse(
+        return room.liveTimeline.sendPollResponse(
             pollStartId = pollStartId,
             answers = listOf(answerId),
         ).onSuccess {

features/poll/impl/src/main/kotlin/io/element/android/features/poll/impl/data/PollRepository.kt

@@ -41,7 +41,7 @@ class PollRepository @Inject constructor(
         pollKind: PollKind,
         maxSelections: Int,
     ): Result<Unit> = when (existingPollId) {
-        null -> room.createPoll(
+        null -> room.liveTimeline.createPoll(
             question = question,
             answers = answers,
             maxSelections = maxSelections,