Evm_node_lib_dev.Sequencer_signalval create :
signer:Signer.t ->
smart_rollup_address:Tezos_crypto.Hashed.Smart_rollup_address.t ->
slot_ids:(int * int32) list ->
[> `External of string ] Tezos_base.TzPervasives.tzresult Lwt.tcreate ~signer ~smart_rollup_address ~slot_ids creates a DAL slot import signal for a given list slot_ids of slot_indices and their corresponding published leveles. Returns an external message input to put in the inbox.