[#1523] local_object_storage: Move blobovnicza tree to a separate package

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

pkg/local_object_storage/blobstor/blobovniczatree/delete.go

@@ -0,0 +1,10 @@
+package blobovniczatree
+
+// DeleteSmallPrm groups the parameters of DeleteSmall operation.
+type DeleteSmallPrm struct {
+	address
+	rwBlobovniczaID
+}
+
+// DeleteSmallRes groups the resulting values of DeleteSmall operation.
+type DeleteSmallRes struct{}