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/.metadata

@@ -4,8 +4,8 @@
 # This file should be version controlled and should not be manually edited.
 
 version:
-  revision: "6b182d2c7585eba26d4edce0f97630effd256c33"
-  channel: "stable"
+  revision: "eb712e92d4c63e8051990ceea01fdcf88a7afd5d"
+  channel: "[user-branch]"
 
 project_type: app
 
@@ -13,14 +13,17 @@ project_type: app
 migration:
   platforms:
     - platform: root
-      create_revision: 6b182d2c7585eba26d4edce0f97630effd256c33
-      base_revision: 6b182d2c7585eba26d4edce0f97630effd256c33
+      create_revision: eb712e92d4c63e8051990ceea01fdcf88a7afd5d
+      base_revision: eb712e92d4c63e8051990ceea01fdcf88a7afd5d
     - platform: android
       create_revision: 6b182d2c7585eba26d4edce0f97630effd256c33
       base_revision: 6b182d2c7585eba26d4edce0f97630effd256c33
     - platform: ios
       create_revision: 6b182d2c7585eba26d4edce0f97630effd256c33
       base_revision: 6b182d2c7585eba26d4edce0f97630effd256c33
+    - platform: ohos
+      create_revision: eb712e92d4c63e8051990ceea01fdcf88a7afd5d
+      base_revision: eb712e92d4c63e8051990ceea01fdcf88a7afd5d
 
   # User provided section