[v5] Strongly-typed state value

[davidkpiano]

Trying this again - supersedes #3940

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[Andarist]

this fixes the contextual type for invoke.src so it can be retained as a string literal

[Andarist]

This will have to be redone on top of #4262 when we land it soon. I'll try to rebase this and test out the test cases that are here before landing TConfig

[Andarist]

So far we can't infer what is needed for this feature and the current attempt at inferring this is in: #4262 . I think there is no reason to have this PR open until we manage to work out the inference part. Let's close it for now, for housekeeping purposes. It's referenced by that other PR so we can always track it back and reopen when/if needed.