expose NextID from nice market actor interface

chain/actors/builtin/market/market.go

@@ -61,6 +61,7 @@ type State interface {
 	VerifyDealsForActivation(
 		minerAddr address.Address, deals []abi.DealID, currEpoch, sectorExpiry abi.ChainEpoch,
 	) (weight, verifiedWeight abi.DealWeight, err error)
+	NextID() (abi.DealID, error)
 }
 
 type BalanceTable interface {

chain/actors/builtin/market/v0.go

@@ -105,6 +105,10 @@ func (s *state0) VerifyDealsForActivation(
 	return market0.ValidateDealsForActivation(&s.State, s.store, deals, minerAddr, sectorExpiry, currEpoch)
 }
 
+func (s *state0) NextID() (abi.DealID, error) {
+	return s.State.NextID, nil
+}
+
 type balanceTable0 struct {
 	*adt0.BalanceTable
 }

chain/actors/builtin/market/v2.go

@@ -106,6 +106,10 @@ func (s *state2) VerifyDealsForActivation(
 	return w, vw, err
 }
 
+func (s *state2) NextID() (abi.DealID, error) {
+	return s.State.NextID, nil
+}
+
 type balanceTable2 struct {
 	*adt2.BalanceTable
 }

chain/actors/builtin/market/v3.go

@@ -106,6 +106,10 @@ func (s *state3) VerifyDealsForActivation(
 	return w, vw, err
 }
 
+func (s *state3) NextID() (abi.DealID, error) {
+	return s.State.NextID, nil
+}
+
 type balanceTable3 struct {
 	*adt3.BalanceTable
 }