Extract constants package

- Reduce clutter in the shared package

pkg/transformers/pit_file/debt_ceiling/config.go

@@ -16,13 +16,14 @@ package debt_ceiling
 
 import (
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/shared/constants"
 )
 
 var DebtCeilingFileConfig = shared.TransformerConfig{
-	TransformerName:     shared.PitFileDebtCeilingLabel,
-	ContractAddresses:   []string{shared.PitContractAddress},
-	ContractAbi:         shared.PitABI,
-	Topic:               shared.PitFileDebtCeilingSignature,
+	TransformerName:     constants.PitFileDebtCeilingLabel,
+	ContractAddresses:   []string{constants.PitContractAddress},
+	ContractAbi:         constants.PitABI,
+	Topic:               constants.PitFileDebtCeilingSignature,
 	StartingBlockNumber: 0,
 	EndingBlockNumber:   10000000,
 }

pkg/transformers/pit_file/debt_ceiling/converter.go

@@ -16,12 +16,12 @@ package debt_ceiling
 
 import (
 	"encoding/json"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/shared/constants"
 	"math/big"
 
 	"bytes"
 	"errors"
 	"github.com/ethereum/go-ethereum/core/types"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
 )
 
 type PitFileDebtCeilingConverter struct{}
@@ -56,7 +56,7 @@ func verifyLog(log types.Log) error {
 	if len(log.Topics) < 2 {
 		return errors.New("log missing topics")
 	}
-	if len(log.Data) < shared.DataItemLength {
+	if len(log.Data) < constants.DataItemLength {
 		return errors.New("log missing data")
 	}
 	return nil