"Create poll" UI (#1143)

NB: This is missing analytics, which will be added once https://github.com/matrix-org/matrix-analytics-events/pull/85 is merged.

Closes https://github.com/vector-im/element-meta/issues/2011

libraries/featureflag/api/src/main/kotlin/io/element/android/libraries/featureflag/api/FeatureFlags.kt

@@ -29,7 +29,7 @@ enum class FeatureFlags(
     Polls(
         key = "feature.polls",
         title = "Polls",
-        description = "Render poll events in the timeline",
+        description = "Create poll and render poll events in the timeline",
         defaultValue = false,
     )
 }