TF-548 Create package contact and base autocomplete method/response

contact/lib/core/method/request/autocomplete_method.dart

@@ -0,0 +1,12 @@
+import 'package:jmap_dart_client/jmap/account_id.dart';
+import 'package:jmap_dart_client/jmap/core/filter/filter.dart';
+import 'package:jmap_dart_client/jmap/core/method/method.dart';
+import 'package:jmap_dart_client/jmap/core/method/request/query_method.dart';
+
+abstract class AutoCompleteMethod extends MethodRequiringAccountId
+    with OptionalLimit {
+
+  final Filter filter;
+
+  AutoCompleteMethod(AccountId accountId, this.filter) : super(accountId);
+}

contact/lib/core/method/response/autocomplete_response.dart

@@ -0,0 +1,14 @@
+import 'package:jmap_dart_client/jmap/account_id.dart';
+import 'package:jmap_dart_client/jmap/core/method/method_response.dart';
+import 'package:jmap_dart_client/jmap/core/unsigned_int.dart';
+
+abstract class AutoCompleteResponse<T> extends ResponseRequiringAccountId {
+  final List<T> list;
+  final UnsignedInt? limit;
+
+  AutoCompleteResponse(
+    AccountId accountId,
+    this.list,
+    this.limit,
+  ) : super(accountId);
+}