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(** [shards ctxt ~level] returns the DAL committee as an association
   list that associates to the public key hash [pkh] of the member of
   the committee an interval [(s,n)], meaning that the slots
   [s;s+1;...;s+n-1] belongs to [pkh]. It is guaranteed that [n>0]. *)
val shards :
  Alpha_context.t ->
  level:Alpha_context.Raw_level.t ->
  (Signature.Public_key_hash.t * (int * int)) list tzresult Lwt.t