[#1523] local_object_storage: Unify parameters for the Exists operation

Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>

pkg/local_object_storage/blobstor/common/exists.go

@@ -0,0 +1,13 @@
+package common
+
+import oid "github.com/nspcc-dev/neofs-sdk-go/object/id"
+
+// ExistsPrm groups the parameters of Exists operation.
+type ExistsPrm struct {
+	Address oid.Address
+}
+
+// ExistsRes groups the resulting values of Exists operation.
+type ExistsRes struct {
+	Exists bool
+}