Add settings to hide images and videos in the timeline.

Hide images, videos and stickers in the timeline.
Disable click on hidden content. It must be revealed first.
Add preview without BlurHash.
Also hide image in thumbnails.

libraries/preferences/test/src/main/kotlin/io/element/android/libraries/preferences/test/InMemoryAppPreferencesStore.kt

@@ -13,11 +13,13 @@ import kotlinx.coroutines.flow.MutableStateFlow
 
 class InMemoryAppPreferencesStore(
     isDeveloperModeEnabled: Boolean = false,
+    hideImagesAndVideos: Boolean = false,
     customElementCallBaseUrl: String? = null,
     theme: String? = null,
     simplifiedSlidingSyncEnabled: Boolean = false
 ) : AppPreferencesStore {
     private val isDeveloperModeEnabled = MutableStateFlow(isDeveloperModeEnabled)
+    private val hideImagesAndVideos = MutableStateFlow(hideImagesAndVideos)
     private val customElementCallBaseUrl = MutableStateFlow(customElementCallBaseUrl)
     private val theme = MutableStateFlow(theme)
     private val simplifiedSlidingSyncEnabled = MutableStateFlow(simplifiedSlidingSyncEnabled)
@@ -54,6 +56,14 @@ class InMemoryAppPreferencesStore(
         return simplifiedSlidingSyncEnabled
     }
 
+    override suspend fun setHideImagesAndVideos(value: Boolean) {
+        hideImagesAndVideos.value = value
+    }
+
+    override fun doesHideImagesAndVideosFlow(): Flow<Boolean> {
+        return hideImagesAndVideos
+    }
+
     override suspend fun reset() {
         // No op
     }