[Feature] Render m.sticker events (#2122)

* Render m.sticker events
---------

Signed-off-by: Marco Antonio Alvarez <surakin@gmail.com>
Co-authored-by: ElementBot <benoitm+elementbot@element.io>

libraries/matrix/api/src/main/kotlin/io/element/android/libraries/matrix/api/timeline/item/event/MessageType.kt

@@ -38,6 +38,12 @@ data class ImageMessageType(
     val info: ImageInfo?
 ) : MessageType
 
+data class StickerMessageType(
+    val body: String,
+    val source: MediaSource,
+    val info: ImageInfo?
+) : MessageType
+
 data class LocationMessageType(
     val body: String,
     val geoUri: String,