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 !

Comience localizando los métodos de factory de clientes mencionados en la issue, incluidos get_git_client y get_build_client, e inspeccione cómo corresponden sus declaraciones rtype de docstring con los clientes devueltos. Determine el alcance de las factories que necesitan anotaciones y verifique que los tipos de retorno resultantes restauren el autocompletado del analizador; la issue no especifica archivos ni pruebas concretos.