feat: Add build info and localization for entry app

- Introduced buildinfo.json5 to enable impeller feature.
- Added Chinese localization strings in string.json for module description and entry ability.
- Created Ability.test.ets for unit testing of ability functionalities.
- Implemented List.test.ets to run the ability tests.
- Developed TestAbility.ets to manage test execution and lifecycle events.
- Created Index.ets as a testability page with UI components.
- Added OpenHarmonyTestRunner.ts for managing test execution in OpenHarmony.
- Defined module.json5 for entry_test module configuration.
- Established color.json and string.json for base resources.
- Included icon.png for the test module.
- Created test_pages.json to define testability page sources.
- Configured hvigor and oh-package.json5 for project setup.
- Updated pubspec.yaml and related files to downgrade Dart SDK to 3.11.0 and adjust dependencies.
- Added PowerShell script to enable OpenHarmony Flutter toolchain.
- Updated multiple package pubspec.yaml files to align with Dart SDK version 3.11.0 and adjust dependencies accordingly.

app/ohos/.gitignore

@@ -0,0 +1,20 @@
+/node_modules
+/oh_modules
+/local.properties
+/.idea
+**/build
+/.hvigor
+.cxx
+/.clangd
+/.clang-format
+/.clang-tidy
+**/.test
+**/BuildProfile.ets
+**/oh-package-lock.json5
+/package.json
+/package-lock.json
+
+**/src/main/resources/rawfile/flutter_assets/
+**/libs/**/libapp.so
+**/libs/**/libflutter.so
+**/libs/**/libvmservice_snapshot.so