feat: Add Aliyun provider support for desktop environment (#304)

* Adding support for aliyun as a provider

* feat: enhance Aliyun provider support

- Added Aliyun as a new provider in the desktop environment.
- Updated the environment configuration guidelines for Aliyun, including prerequisites and environment variables.
- Implemented instance allocation and management functions for Aliyun ECS, including signal handling for graceful termination.
- Improved logging and error handling during instance creation and status checks.
- Adjusted the provider's methods to utilize the new instance management functions.

desktop_env/providers/__init__.py

@@ -31,5 +31,9 @@ def create_vm_manager_and_provider(provider_name: str, region: str, use_proxy: b
         from desktop_env.providers.docker.manager import DockerVMManager
         from desktop_env.providers.docker.provider import DockerProvider
         return DockerVMManager(), DockerProvider(region)
+    elif provider_name == "aliyun":
+        from desktop_env.providers.aliyun.manager import AliyunVMManager
+        from desktop_env.providers.aliyun.provider import AliyunProvider
+        return AliyunVMManager(), AliyunProvider()
     else:
         raise NotImplementedError(f"{provider_name} not implemented!")