feature request: use original file suffix in temp files
I'm using `importlib_resources.path` to get a real path to resource (e.g. a settings file `foobar.json` or `foobar.yaml`). When using this from a wheel, the path is something like `/tmp/tmp163kokqj`, which makes it hard to detect what format the file is.
It would be handy if the temp file had at least the same extension as the original file.
issue