Hamilton action improvements for taking state in/out

[elijahbenizzy]

Problems with Hamilton integration:

• We can't modify inputs from state
• We can't modify outputs to state

Idea:

h = Hamilton( 
    inputs={"most_recent_item": from_state("all_items", process=lambda x: x[-1]) # get the last one
    outputs={"count": update_state("count", process=lambda count: count + 1)} # increments it
)

Also:

h = Hamilton(
    inputs=...,
    outputs=...,
    extra_updates=lambda result, state: ...
)

[andreahlert]

Labels migrated to new taxonomy (#692).

[andreahlert]

Closing this one. Hamilton integration is legacy at this point and hasn't seen any demand since the move to Apache. If someone needs improvements here they can open a fresh issue with specific scope.