similar to how you parse the cell's input variables, it would be cool if you parsed the files being read (e.g. `pd.read_parquet` and `file.open`) or databases/s

similar to how you parse the cell's input variables, it would be cool if you parsed the files being read (e.g. `pd.read_parquet` and `file.open`) or databases/sources. you could show metadata about the sources next to it. this UI setting could be turned off if every cell i/o from the same file