Select residence country by searchable name (#64)

frontend/app/pubspec.lock

@@ -49,6 +49,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.19.1"
+  country_picker:
+    dependency: "direct main"
+    description:
+      name: country_picker
+      sha256: "8ef721183bd7e0a6017c413693cdc68051daceef5790f5420c3b4378b5c69115"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.0.28"
   cross_file:
     dependency: transitive
     description:
@@ -525,6 +533,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.4.0"
+  universal_io:
+    dependency: transitive
+    description:
+      name: universal_io
+      sha256: f63cbc48103236abf48e345e07a03ce5757ea86285ed313a6a032596ed9301e2
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.3.1"
   vector_math:
     dependency: transitive
     description: