fix: add SlotState to LedgerState interface (#1176)

Signed-off-by: Aurora Gaffney <[email protected]>

Author: agaffney

internal/test/ledger/ledger.go

@@ -16,6 +16,7 @@ package test_ledger
 
 import (
 	"errors"
+	"time"
 
 	"github.com/blinklabs-io/gouroboros/ledger/common"
 )
@@ -77,3 +78,13 @@ func (ls MockLedgerState) PoolRegistration(
 	}
 	return ret, nil
 }
+
+func (ls MockLedgerState) SlotToTime(slot uint64) (time.Time, error) {
+	// TODO
+	return time.Now(), nil
+}
+
+func (ls MockLedgerState) TimeToSlot(t time.Time) (uint64, error) {
+	// TODO
+	return 0, nil
+}

ledger/common/state.go

@@ -35,6 +35,7 @@ type CertState interface {
 type LedgerState interface {
 	UtxoState
 	CertState
+	SlotState
 	NetworkId() uint
 }