feat(CLI): Have a way to show all exposed services in the environment

[gaocegege]

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Description

There is no way to tell users which port will be used and how many services are running in the environment with the given build.envd.

We should have a way to show the info to users.

def build():
    base(os="ubuntu20.04", language="python3")
    shell("zsh")
    install.cuda(version="11.2.0", cudnn="8")
    install.python_packages(
        [
            "torch",
            "torchvision",
            "torch_tb_profiler",
            "--extra-index-url https://download.pytorch.org/whl/cu113",
        ]
    )
    envdlib.tensorboard(envd_port=8888, envd_dir="/home/envd/log", host_port=8888)

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[VoVAllen]

Related issue https://github.com/tensorchord/envd/issues/551