Add feature flag for polls (#1064)

* Handle poll events from the sdk

* Render started poll event in the timeline

* Create poll module

* Check poll kind before revealing the results

* Check if user has voted before revealing the results

* Add active poll previews

* Minor cleanup

* Update todos

* Fix CI

* Remove hardcoded string

* Update preview

* changelog file

* Update screenshots

* Use CommonPlurals

* Set poll root view as selectableGroup

* Improve poll result rendering

* Update screenshots

* Add missing showkase processor

* Update screenshots

* Add feature flag for polls

* Add supporting text in PreferenceCheckbox

* Render poll events if feature flag is enabled

* changelog

* Update screenshots

* Fix tests

* Move feature flag check to poll factory

---------

Co-authored-by: ElementBot <benoitm+elementbot@element.io>

libraries/featureflag/ui/src/main/kotlin/io/element/android/libraries/featureflag/ui/FeatureListView.kt

@@ -54,6 +54,7 @@ fun FeaturePreferenceView(
 ) {
     PreferenceCheckbox(
         title = feature.title,
+        supportingText = feature.description,
         isChecked = feature.isEnabled,
         modifier = modifier,
         onCheckedChange = onCheckedChange

libraries/featureflag/ui/src/main/kotlin/io/element/android/libraries/featureflag/ui/model/FeatureUiModel.kt

@@ -19,5 +19,6 @@ package io.element.android.libraries.featureflag.ui.model
 data class FeatureUiModel(
     val key: String,
     val title: String,
+    val description: String?,
     val isEnabled: Boolean
 )

libraries/featureflag/ui/src/main/kotlin/io/element/android/libraries/featureflag/ui/model/FeatureUiModelProvider.kt

@@ -21,7 +21,7 @@ import kotlinx.collections.immutable.persistentListOf
 
 fun aFeatureUiModelList(): ImmutableList<FeatureUiModel> {
     return persistentListOf(
-        FeatureUiModel("key1", "Display State Events", true),
-        FeatureUiModel("key2", "Display Room Events", false)
+        FeatureUiModel("key1", "Display State Events", "Show state events in the timeline", true),
+        FeatureUiModel("key2", "Display Room Events", null, false),
     )
 }