feat: Remove original file stem from filenames in the blobstorage (#4309)

This way filenames in the blobstorage are just random hex numbers. This also allows us to get rid of
the `sanitize-filename` dependency.

This also requires `Param::Filename` to be set to "debug_logging*.xdc" for messages containing
logging webxdc-s, otherwise they are not detected properly. This is done in "fix:
Message::set_file_from_bytes(): Set Param::Filename", so don't forget to update senders as well.

src/receive_imf.rs

@@ -1577,9 +1577,7 @@ RETURNING id
             context,
             part.typ,
             chat_id,
-            part.param
-                .get_path(Param::File, context)
-                .unwrap_or_default(),
+            part.param.get(Param::Filename),
             *msg_id,
         )
         .await?;