[Media upload] Add media pickers to the Room screen and the composer (#380)

* Add media pickers to the Room screen and the composer.

* Fix exclude rules for translations

tools/localazy/config.json

@@ -85,6 +85,18 @@
         "screen_room_member_list_.*",
         "screen_dm_details_.*"
       ]
+    },
+    {
+      "name": ":features:messages:impl",
+      "includeRegex": [
+        "screen_room_.*",
+        "screen_dm_details_.*"
+      ],
+      "excludeRegex": [
+        "screen_room_details_.*",
+        "screen_room_member.*",
+        "screen_dm_.*"
+      ]
     }
   ]
 }