Need support for managed identities for azure

Hey 👋 ,
So, is there a way to connect azure services using managed identities. Incase of google I can see support for service account https://github.com/apache/libcloud/blob/6e39117d6f686e2f49b12fc8a24168d13b6e0ada/libcloud/common/google.py#L542

Also, I see that we are accepting identity as a param, what does it signify? both secret and identity are needed ? https://github.com/apache/libcloud/blob/6e39117d6f686e2f49b12fc8a24168d13b6e0ada/libcloud/common/azure.py#L117

Please pardon me if the solution or any workarounds already exist, thank you!

首先阅读 libcloud/common/azure.py 中 identity 参数附近的代码，并将其与 libcloud/common/google.py 中对服务账户的处理进行比较。明确 Azure 托管身份应如何在没有 secret 的情况下建立连接，然后定义所需的支持及其完成标准。

由索引模型根据 Issue 内容生成。