feat(ui_kit): add text input theme extension (#138)

packages/wyatt_ui_kit/lib/src/domain/input_text_theme_extension.dart

@@ -0,0 +1,36 @@
+// Copyright (C) 2023 WYATT GROUP
+// Please see the AUTHORS file for details.
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+import 'package:flutter/material.dart';
+import 'package:wyatt_ui_components/wyatt_wyatt_ui_components.dart';
+
+abstract class InputTexThemetExtension
+    extends ThemeExtension<InputTexThemetExtension> {
+  InputTexThemetExtension({
+    this.backgroundColors,
+    this.borderColors,
+    this.floatingLabelTextStyle,
+    this.inputStyle,
+  });
+
+  // Colors:
+  final MultiColor? backgroundColors;
+  final MultiColor? borderColors;
+
+  // TextStyles:
+  final TextStyle? floatingLabelTextStyle;
+  final TextStyle? inputStyle;
+}