feat(mobile): add cast support (#18341)

* initial cast framework complete and mocked cast dialog working

* wip casting

* casting works!

just need to add session key check and remote video controls

* cleanup of classes

* add session expiration checks

* cast dialog now shows connected device at top of list with a list header. Discovered devices are also cached for app session.

* cast video player finalized

* show fullsize assets on casting

* translation already happens on the text element

* remove prints

* fix lintings

* code review changes from @shenlong-tanwen

* fix connect method override

* fix alphabetization

* remove important

* filter chromecast audio devices

* fix some disconnect command ordering issues and unawaited futures

* remove prints

* only disconnect if we are connected

* don't try to reconnect if its the current device

* add cast button to top bar

* format sessions api

* more formatting issues fixed

* add snack bar to tell user that we cannot cast an asset that is not uploaded to server

* make casting icon change to primary color when casting is active

* only show casting snackbar if we are casting

* dont show cast button if asset is remote and we are not casting

* stop playing media if we seek to an asset that is not remote

* remove https check since it works with local http IP addresses

* remove unneeded imports

* fix recasting when socket closes

* fix info plist formatting

* only show cast button if there is an active websocket connection (ie the server is accessible)

* add device capability bitmask checks

* small comment about bitmask

i18n/en.json

@@ -649,6 +649,7 @@
   "confirm_password": "Confirm password",
   "confirm_tag_face": "Do you want to tag this face as {name}?",
   "confirm_tag_face_unnamed": "Do you want to tag this face?",
+  "connected_device": "Connected device",
   "connected_to": "Connected to",
   "contain": "Contain",
   "context": "Context",
@@ -749,6 +750,7 @@
   "disallow_edits": "Disallow edits",
   "discord": "Discord",
   "discover": "Discover",
+  "discovered_devices": "Discovered devices",
   "dismiss_all_errors": "Dismiss all errors",
   "dismiss_error": "Dismiss error",
   "display_options": "Display options",
@@ -1133,6 +1135,7 @@
   "list": "List",
   "loading": "Loading",
   "loading_search_results_failed": "Loading search results failed",
+  "local_asset_cast_failed": "Unable to cast an asset that is not uploaded to the server",
   "local_network": "Local network",
   "local_network_sheet_info": "The app will connect to the server through this URL when using the specified Wi-Fi network",
   "location_permission": "Location permission",
@@ -1273,6 +1276,7 @@
   "no_archived_assets_message": "Archive photos and videos to hide them from your Photos view",
   "no_assets_message": "CLICK TO UPLOAD YOUR FIRST PHOTO",
   "no_assets_to_show": "No assets to show",
+  "no_cast_devices_found": "No cast devices found",
   "no_duplicates_found": "No duplicates were found.",
   "no_exif_info_available": "No exif info available",
   "no_explore_results_message": "Upload more photos to explore your collection.",
@@ -1769,6 +1773,7 @@
   "start_date": "Start date",
   "state": "State",
   "status": "Status",
+  "stop_casting": "Stop casting",
   "stop_motion_photo": "Stop Motion Photo",
   "stop_photo_sharing": "Stop sharing your photos?",
   "stop_photo_sharing_description": "{partner} will no longer be able to access your photos.",