Address repo updates (#134)

* Factor out get or create address into one sql string

* Factor out getChecksumAddress method in address repo

* Update address repo methods to not need a receiver

* Move address repository to libraries/shared

pkg/contract_watcher/full/retriever/block_retriever.go

@@ -18,8 +18,8 @@ package retriever
 
 import (
 	"database/sql"
+	"github.com/vulcanize/vulcanizedb/libraries/shared/repository"
 	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
-	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres/repositories"
 )
 
 // Block retriever is used to retrieve the first block for a given contract and the most recent block
@@ -55,7 +55,7 @@ func (r *blockRetriever) RetrieveFirstBlock(contractAddr string) (int64, error)
 // For some contracts the contract creation transaction receipt doesn't have the contract address so this doesn't work (e.g. Sai)
 func (r *blockRetriever) retrieveFirstBlockFromReceipts(contractAddr string) (int64, error) {
 	var firstBlock int64
-	addressId, getAddressErr := addressRepository().GetOrCreateAddress(r.db, contractAddr)
+	addressId, getAddressErr := repository.GetOrCreateAddress(r.db, contractAddr)
 	if getAddressErr != nil {
 		return firstBlock, getAddressErr
 	}
@@ -72,10 +72,6 @@ func (r *blockRetriever) retrieveFirstBlockFromReceipts(contractAddr string) (in
 	return firstBlock, err
 }
 
-func addressRepository() repositories.AddressRepository {
-	return repositories.AddressRepository{}
-}
-
 // In which case this servers as a heuristic to find the first block by finding the first contract event log
 func (r *blockRetriever) retrieveFirstBlockFromLogs(contractAddr string) (int64, error) {
 	var firstBlock int