Refactor mobile to use OpenApi generated SDK (#336)

mobile/openapi/lib/auth/authentication.dart

@@ -0,0 +1,17 @@
+//
+// AUTO-GENERATED FILE, DO NOT MODIFY!
+//
+// @dart=2.12
+
+// ignore_for_file: unused_element, unused_import
+// ignore_for_file: always_put_required_named_parameters_first
+// ignore_for_file: constant_identifier_names
+// ignore_for_file: lines_longer_than_80_chars
+
+part of openapi.api;
+
+// ignore: one_member_abstracts
+abstract class Authentication {
+  /// Apply authentication settings to header and query params.
+  void applyToParams(List<QueryParam> queryParams, Map<String, String> headerParams);
+}