Extract constants package

- Reduce clutter in the shared package

pkg/transformers/frob/config.go

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

pkg/transformers/frob/converter_test.go

@@ -15,19 +15,19 @@
 package frob_test
 
 import (
+	"github.com/ethereum/go-ethereum/core/types"
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
 
-	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/frob"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/shared/constants"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/test_data"
 )
 
 var _ = Describe("Frob converter", func() {
 	var converter = frob.FrobConverter{}
 	It("converts a log to an entity", func() {
-		entities, err := converter.ToEntities(shared.PitABI, []types.Log{test_data.EthFrobLog})
+		entities, err := converter.ToEntities(constants.PitABI, []types.Log{test_data.EthFrobLog})
 
 		Expect(err).NotTo(HaveOccurred())
 		Expect(len(entities)).To(Equal(1))