Handling lists the typical way shells might do (e.g. with globs for files)

When working with files, I'd like to be able to do something like `mycli -i ./**/*.hs` and have all the files populate `[FilePath]`. MVE:

```haskell
data MyCLI = MyCLI { files :: [FilePath], output :: FilePath }
deriving (Generic)
deriving anyclass (ParseRecord)

main :: IO ()
main = getRecord "file-based CLI" >>= print
```

Running this as `cabal run mycli -- --files ./**/*.hs --output ./output.txt` fails to parse with "InvalidArgument".

I can see that, from the docs, you expect lists to be handled as `--files x.hs --files y.hs` etc., but with file globbing that's not going to happen.