[Gekidou] Gallery (#6008)

* Gallery screen (ground work)

* Open the gallery from posts

* Open the gallery from post draft

* feedback review

* Feedback review 2

* do not remove dm channel names and localization fix

* update to the latest network-client

* do not override file width, height and imageThumbail if received file does not have it set

* bring back ScrollView wrapper for message component

* Remove Text wrapper for markdown paragraph

* Fix YouTube play icon placeholder

* Make video file play button container round

* Add gif image placeholder

* Save images & videos to camera roll

* Feedback review 3

* load video thumbnail when post is in viewport

* simplify prefix

app/utils/url/index.ts

@@ -269,3 +269,8 @@ export function cleanUrlForLogging(baseUrl: string, apiUrl: string): string {
 
     return url;
 }
+
+export function extractFilenameFromUrl(url: string) {
+    const uri = urlParse(url);
+    return uri.pathname.split('/').pop();
+}