Simplify YAML API (GetResource) with prompt values

[lblackstone]

Problem description

The YAML API currently creates resources stored as Outputs in the TS, Python, and .NET SDKs. We are choosing to diverge from this behavior in the Go SDK because it makes the API meaningfully simpler to use.

Prompt example:

hostIP := resources.GetResource("v1/Pod", "foo", "").(*corev1.Pod).Status.HostIP()

Output example:

hostIP := resources.GetResource("v1/Pod", "foo", "").Apply(func(r interface{}) (interface{}, error) {
	pod := r.(*corev1.Pod)
	return pod.Status.HostIP(), nil
})

There's currently no strong technical reason that we couldn't use a prompt API for the other SDKs as well.

Related: #1107