Implement type hints on top of docstring `rtype`

Hi,

The code is quite well documented, and uses docstring heavily. However, the "Python way" is to use type hints which are powerful and enable a good code completion.

For exaample, the client factory (get_git_client, get_build_client, ...) does not have type hints. Due to how it is written, python analyzers can not infer the returned types and this breaks autocompletion.

Could you please generate them them?

For example something like this:

    def get_git_client(self) -> GitClient:
        """get_git_client.
        Gets the 7.0 version of the GitClient
        :rtype: :class:`<GitClient> <azure.devops.v7_0.git.git_client.GitClient>`
        """
        return self._connection.get_client('azure.devops.v7_0.git.git_client.GitClient')

Thanks !

首先定位 issue 中提到的客户端工厂方法，包括 get_git_client 和 get_build_client，并检查其 docstring 中的 rtype 声明与返回的客户端之间的对应关系。确定需要添加注解的工厂范围，并验证生成的返回类型能够恢复 analyzer 的自动补全功能；该 issue 未指定具体的文件或测试。