[#1557] morph/event: Remove embedded structs from scriptHashWithValue

Also, make them public, because otherwise `unused` linter complains.
```
pkg/morph/event/utils.go:25:2  unused  field `typ` is unused
```
This complain is wrong, though: we _use_ `typ` field because the whole
struct is used as a map key.

Signed-off-by: Evgenii Stratonikov <e.stratonikov@yadro.com>

pkg/morph/event/utils.go

@@ -20,13 +20,9 @@ type scriptHashValue struct {
 	hash util.Uint160
 }
 
-type typeValue struct {
-	typ Type
-}
-
 type scriptHashWithType struct {
-	scriptHashValue
-	typeValue
+	Hash util.Uint160
+	Type Type
 }
 
 type notaryRequestTypes struct {
@@ -73,16 +69,6 @@ func (s scriptHashValue) ScriptHash() util.Uint160 {
 	return s.hash
 }
 
-// SetType is an event type setter.
-func (s *typeValue) SetType(v Type) {
-	s.typ = v
-}
-
-// GetType is an event type getter.
-func (s typeValue) GetType() Type {
-	return s.typ
-}
-
 // WorkerPoolHandler sets closure over worker pool w with passed handler h.
 func WorkerPoolHandler(w util2.WorkerPool, h Handler, log *logger.Logger) Handler {
 	return func(ctx context.Context, e Event) {