[Feature]: get the same information about the controller as using juju show-controller

[rgildein]

Description

It would really helpful if we could get information about the controller as can be done with juju show-controller. Currently, it is not possible to get such data using libjuju.

There is info function in the controller, but that returns a different output. I previously reported it as bug #795, but after discussion I found out that `controller.info' is not suitable for this and it's designed to return info about connection to controller.

Urgency

Casually wishlisting

Code I'd Like to Run

import asyncio
from juju.controller import Controller


async def get_info():
    controller = Controller()
    await controller.connect()
    info = await controller.show_controller()
    print(info)  # this should provide same info as `juju show-controller <name>`

asyncio.run(get_info())

[github-actions]

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