[#1546] morph/event: Export NotificationHandlerInfo fields

Hiding them achieves nothing, as the struct has no methods and is not
used concurrently.

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

pkg/morph/event/handlers.go

@@ -4,6 +4,7 @@ import (
 	"context"
 
 	"github.com/nspcc-dev/neo-go/pkg/core/block"
+	"github.com/nspcc-dev/neo-go/pkg/util"
 )
 
 // Handler is an Event processing function.
@@ -16,25 +17,10 @@ type BlockHandler func(context.Context, *block.Block)
 // the parameters of the handler of particular
 // contract event.
 type NotificationHandlerInfo struct {
-	scriptHashWithType
-
-	parser   NotificationParser
-	handlers []Handler
-}
-
-// SetParser is an event handler setter.
-func (s *NotificationHandlerInfo) SetParser(p NotificationParser) {
-	s.parser = p
-}
-
-// AddHandler adds an event handler.
-func (s *NotificationHandlerInfo) AddHandler(v Handler) {
-	s.handlers = append(s.handlers, v)
-}
-
-// Handler returns an event handler.
-func (s NotificationHandlerInfo) Handlers() []Handler {
-	return s.handlers
+	Contract util.Uint160
+	Type     Type
+	Parser   NotificationParser
+	Handlers []Handler
 }
 
 // NotaryHandlerInfo is a structure that groups