Proposal: Introduce `WorkflowUICommon`

[dhavalshreyas]

Proposal: Introduce `WorkflowUICommon`

[AquaGeek]

IIRC, they're in Samples currently because we explicitly don't want them to be added as dependencies elsewhere — they're just guideposts to help others build their own containers. Outside of that, are we willing to take on the maintenance burden of these, given we use parallel implementations internally?

[AquaGeek]

One of the suggestions @bencochran brought up internally was the option of us publishing the structs for these Screens (instead of both the struct and the UIViewController) and allowing folks to add the conformance to Screen themselves (BYO view controller). That would at least let us close the gaps between these samples and our own internal versions.

[zach-klippenstein]

I believe this is the approach we're currently using in kotlin.