[Message Actions] Add emoji reactions option (#568)

* Add logic to send message reactions

* Add emoji library, create EmojiPicker component

* Fix bottom sheet behaviors

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

libraries/matrix/impl/src/main/kotlin/io/element/android/libraries/matrix/impl/room/RustMatrixRoom.kt

@@ -259,6 +259,12 @@ class RustMatrixRoom(
         }
     }
 
+    override suspend fun sendReaction(emoji: String, eventId: EventId): Result<Unit> = withContext(Dispatchers.IO) {
+        runCatching {
+            innerRoom.sendReaction(key = emoji, eventId = eventId.value)
+        }
+    }
+
     @OptIn(ExperimentalUnsignedTypes::class)
     override suspend fun updateAvatar(mimeType: String, data: ByteArray): Result<Unit> =
         withContext(Dispatchers.IO) {