[#1367] fstree: Add size hint for Delete

This allow to not to call `os.Stat` if caller already knows data size.

Signed-off-by: Dmitrii Stepanov <d.stepanov@yadro.com>

pkg/local_object_storage/blobstor/common/delete.go

@@ -8,6 +8,7 @@ import (
 type DeletePrm struct {
 	Address   oid.Address
 	StorageID []byte
+	Size      uint64
 }
 
 // DeleteRes groups the resulting values of Delete operation.