Property Validation: `anyOf`

[everettraven]

The anyOf constraint on a property means that the value must match at least one of the subschemas.

My current take on this is:

• Adding a new anyOf schema is likely OK. From what I understand, this would not break any existing client/user expectations or invalidate any existing instances of the resource
• Removing/Net-New/Changing an anyOf schema is breaking

[abhinovp]

@everettraven Please assign this issue to me, I got an idea of what needs to be done.

[abhinovp]

/assign