(VDB-68) Verify log block hash matches header block hash

- Delete header on conflict to prompt data refresh (cascade deletes all
  data associated with that block)
- Derive header hash from rpc payload rather than computing it from data
  (prevents hash mismatch between blockchain and cache)

cmd/continuousLogSync.go

@@ -40,7 +40,7 @@ Available transformers for (optional) selection with --transformers:
 %v
 
 This command expects a light sync to have been run, and the presence of header records in the Vulcanize database.`,
-	constants.AllTransformerLabels()),
+		constants.AllTransformerLabels()),
 	Run: func(cmd *cobra.Command, args []string) {
 		syncMakerLogs()
 	},