Add timestamp to block header

- Enables quickly deriving timestamp from header for log events

pkg/fakes/data.go

@@ -1,5 +1,24 @@
 package fakes
 
-import "errors"
+import (
+	"encoding/json"
+	"errors"
+	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/vulcanize/vulcanizedb/pkg/core"
+)
 
 var FakeError = errors.New("failed")
+
+var rawFakeHeader, _ = json.Marshal(types.Header{})
+var FakeHeader = core.Header{
+	Raw:       rawFakeHeader,
+	Timestamp: "111111111",
+}
+
+func GetFakeHeader(blockNumber int64) core.Header {
+	return core.Header{
+		BlockNumber: blockNumber,
+		Raw:         rawFakeHeader,
+		Timestamp:   "111111111",
+	}
+}