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 中提到的用戶端工廠方法，包括 get_git_client 和 get_build_client，並檢查其 docstring 中的 rtype 宣告與回傳的用戶端之間的對應關係。確定需要新增註解的工廠範圍，並驗證產生的回傳型別能夠恢復 analyzer 的自動完成；該 issue 未指定具體的檔案或測試。