feat(mobile) Add OAuth Login On Mobile (#990)

* Added return type for oauth/callback

* Remove console.log

* Redirect app

* Wording

* Added loading state change

* Added OAuth login on mobile

* Return correct status for  correct redirection

* Auto discovery OAuth Login

mobile/pubspec.lock

@@ -366,6 +366,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "2.0.0"
+  flutter_web_auth:
+    dependency: "direct main"
+    description:
+      name: flutter_web_auth
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.5.0"
   flutter_web_plugins:
     dependency: transitive
     description: flutter