Support public IPs

[smcclure20]

Allow users to add public IPs to a resource.

[divega]

@smcclure20 in your mind, does this issue seem like it should be relatively easy (e.g., "good first issue" label worthy) or on the contrary "needs design" worthy?

[smcclure20]

I think we need to discuss exactly what the UI should be to create a public IP, but other than that, it should be easy.