Use in-memory thumbnail APIs when possible (#3817)

* Use in-memory thumbnail APIs when possible

* Make an exception for animated image types.

Also add `TimelineItemImageContent.thumbnailMediaRequestData` lazy property.

* Try simplifying the logic a bit more.

libraries/core/src/main/kotlin/io/element/android/libraries/core/mimetype/MimeTypes.kt

@@ -38,6 +38,7 @@ object MimeTypes {
     fun String?.normalizeMimeType() = if (this == BadJpg) Jpeg else this
 
     fun String?.isMimeTypeImage() = this?.startsWith("image/").orFalse()
+    fun String?.isMimeTypeAnimatedImage() = this == Gif || this == WebP
     fun String?.isMimeTypeVideo() = this?.startsWith("video/").orFalse()
     fun String?.isMimeTypeAudio() = this?.startsWith("audio/").orFalse()
     fun String?.isMimeTypeApplication() = this?.startsWith("application/").orFalse()

libraries/matrix/impl/src/main/kotlin/io/element/android/libraries/matrix/impl/media/RustMediaLoader.kt

@@ -37,7 +37,7 @@ class RustMediaLoader(
         withContext(mediaDispatcher) {
             runCatching {
                 source.toRustMediaSource().use { source ->
-                    innerClient.getMediaContent(source).toUByteArray().toByteArray()
+                    innerClient.getMediaContent(source)
                 }
             }
         }
@@ -55,7 +55,7 @@ class RustMediaLoader(
                         mediaSource = mediaSource,
                         width = width.toULong(),
                         height = height.toULong()
-                    ).toUByteArray().toByteArray()
+                    )
                 }
             }
         }

libraries/matrixui/src/main/kotlin/io/element/android/libraries/matrix/ui/media/MediaRequestData.kt

@@ -37,3 +37,9 @@ data class MediaRequestData(
         }
     }
 }
+
+/** Max width a thumbnail can have according to [the spec](https://spec.matrix.org/v1.10/client-server-api/#thumbnails). */
+const val MAX_THUMBNAIL_WIDTH = 800L
+
+/** Max height a thumbnail can have according to [the spec](https://spec.matrix.org/v1.10/client-server-api/#thumbnails). */
+const val MAX_THUMBNAIL_HEIGHT = 600L