[poc] Use a functionBrand to make limited callback actors possible

[Andarist]

reusing the brand trick from #4256 to allow implementing type-safe~ callbacks actors that can only be used within machines that accept events that they might sendBack to them

related to https://discord.com/channels/795785288994652170/1177607380905775165/1184957932878696458

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[Andarist]

the error here is expected, that's the whole point of this PR :P