Add the logic which will call disk image conversion from disk image route

virtweb_backend/src/utils/file_size_utils.rs

@@ -1,5 +1,14 @@
 #[derive(
-    serde::Serialize, serde::Deserialize, Copy, Clone, Debug, Eq, PartialEq, PartialOrd, Ord,
+    serde::Serialize,
+    serde::Deserialize,
+    Copy,
+    Clone,
+    Debug,
+    Eq,
+    PartialEq,
+    PartialOrd,
+    Ord,
+    Default,
 )]
 pub struct FileSize(usize);