handle properties which can be multiple types

[jhsinger-klotho]

in k8s specs we often see IntOrString types or things like

type Quantity struct {
	// i is the quantity in int64 scaled form, if d.Dec == nil
	i int64Amount
	// d is the quantity in inf.Dec form if d.Dec != nil
	d infDecAmount
	// s is the generated value of this quantity to avoid recalculation
	s string

	// Change Format at will. See the comment for Canonicalize for
	// more details.
	Format
}

We need to be able to handle taking in multiple types for this

proposing the backend be structured similarly to

                      AverageValue:
                        type: (int, string)
                      Value:
                        type: (int, string)```