(VDB-298) Consume Pit contract storage diffs

- Continuously parse storage diffs CSV data to read Pit contract state
- Convert ilks in database to raw bytes32 value for use in generating
  storage keys dynamically
- Persist storage diffs with block number and hash for validation

pkg/transformers/bite/converter.go

@@ -17,7 +17,6 @@
 package bite
 
 import (
-	"bytes"
 	"encoding/json"
 	"fmt"
 	"github.com/ethereum/go-ethereum/accounts/abi/bind"
@@ -64,7 +63,7 @@ func (converter BiteConverter) ToModels(entities []interface{}) ([]interface{},
 			return nil, fmt.Errorf("entity of type %T, not %T", entity, BiteEntity{})
 		}
 
-		ilk := string(bytes.Trim(biteEntity.Ilk[:], "\x00"))
+		ilk := common.Bytes2Hex(biteEntity.Ilk[:])
 		urn := common.BytesToAddress(biteEntity.Urn[:]).String()
 		ink := biteEntity.Ink
 		art := biteEntity.Art

pkg/transformers/bite/converter_test.go

@@ -70,7 +70,7 @@ var _ = Describe("Bite Converter", func() {
 			emptyLog, err := json.Marshal(types.Log{})
 			Expect(err).NotTo(HaveOccurred())
 			expectedModel := bite.BiteModel{
-				Ilk:              "",
+				Ilk:              "0000000000000000000000000000000000000000000000000000000000000000",
 				Urn:              "0x0000000000000000000000000000000000000000",
 				Ink:              "",
 				Art:              "",