change transformer interface and watcher so that contract config is now fed into AddTransformers such that a single watcher can be loaded with transformers that use different cofigs

libraries/shared/contract_config.go

@@ -0,0 +1,17 @@
+package shared
+
+import (
+	"github.com/ethereum/go-ethereum/accounts/abi"
+	"github.com/vulcanize/vulcanizedb/pkg/filters"
+)
+
+type ContractConfig struct {
+	Address    string
+	Owner      string
+	Abi        string
+	ParsedAbi  abi.ABI
+	FirstBlock int64
+	LastBlock  int64
+	Name       string
+	Filters    []filters.LogFilter
+}