feat: add notification policy and password change message (#5065)

Implementation of new notification policy with functionality to send email when a password is changed

internal/api/grpc/policy/notification_policy.go

@@ -0,0 +1,20 @@
+package policy
+
+import (
+	"github.com/zitadel/zitadel/internal/api/grpc/object"
+	"github.com/zitadel/zitadel/internal/query"
+	policy_pb "github.com/zitadel/zitadel/pkg/grpc/policy"
+)
+
+func ModelNotificationPolicyToPb(policy *query.NotificationPolicy) *policy_pb.NotificationPolicy {
+	return &policy_pb.NotificationPolicy{
+		IsDefault:      policy.IsDefault,
+		PasswordChange: policy.PasswordChange,
+		Details: object.ToViewDetailsPb(
+			policy.Sequence,
+			policy.CreationDate,
+			policy.ChangeDate,
+			policy.ResourceOwner,
+		),
+	}
+}