Bring Baremetal Node API to Parity with Python SDK

[Sharpz7]

Continuing the work from https://github.com/gophercloud/gophercloud/issues/3135, I would like to bring the whole of the Node API to parity in one PR.

I think this achieves the right size to make my life easier, while also making it a manageable size for review.

For example, this will include things like https://github.com/gophercloud/gophercloud/blob/82a1eb232de4de68f3bd3e5d1205fde12c3ef193/openstack/baremetal/v1/nodes/results.go#L432

I am happy to work on this personally. Let me know if I should narrow the scope :))