Implement MSC2530 (#2570)

* Implement MSC2530
* Some layout improvements for images and videos with captions
* Update screenshots
* Replace `it` in several previews with `isMine`

---------

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

libraries/push/impl/src/test/kotlin/io/element/android/libraries/push/impl/notifications/NotifiableEventResolverTest.kt

@@ -190,7 +190,7 @@ class NotifiableEventResolverTest {
                 createNotificationData(
                     content = NotificationContent.MessageLike.RoomMessage(
                         senderId = A_USER_ID_2,
-                        messageType = VideoMessageType(body = "Video", MediaSource("url"), null)
+                        messageType = VideoMessageType(body = "Video", null, null, MediaSource("url"), null)
                     )
                 )
             )
@@ -224,7 +224,7 @@ class NotifiableEventResolverTest {
                 createNotificationData(
                     content = NotificationContent.MessageLike.RoomMessage(
                         senderId = A_USER_ID_2,
-                        messageType = ImageMessageType("Image", MediaSource("url"), null),
+                        messageType = ImageMessageType("Image", null, null, MediaSource("url"), null),
                     )
                 )
             )