P1993 Restore factories to bulk_execute

[wg21bot]

P1993R0 Restore factories to bulk_execute (Jared Hoberock)

[wg21bot]

P1993R1 Restore shared state to bulk_execute (Jared Hoberock)

[ogiroux]

SG1 in Prague

We should add a sender argument and sender result to bulk execution functions.
(providing an opportunity to build shared state, establish dependencies in/out)
SF F N A SA
17 7 0 0 0

Unanimous consent.

We should replace bulk_execute with indexed_for.
SF F N A SA
4 11 3 7 1
SA: let the minutes reflect!

No consensus for change.

The bulk_execute primitive should take an execution policy to constrain the invocable.
SF F N A SA
5 7 8 3 1
SA: I think it breaks 443 for bulk execution

Consensus for change.