future: Add a is_tuple_effectively_trivially_move_constructible_and_destructible
future: Add a is_tuple_effectively_trivially_move_constructible_and_destructible

This is a temporary helper for making future_state non variadic.

Signed-off-by: Rafael Ávila de Espíndola <1975039f9046bf513b77c0c5639a0efc25f00e7f@scylladb.com>

scylladb/seastar,dreamsxin/seastar,cloudius-systems/seastar,syuu1228/seastar,avikivity/seastar,cloudius-systems/seastar,syuu1228/seastar,avikivity/seastar,syuu1228/seastar,avikivity/seastar,scylladb/seastar,dreamsxin/seastar,cloudius-systems/seastar,dreamsxin/seastar,scylladb/seastar