Support running against a user-provided `nvim` binary

[szbergeron]

Neovim 0.10 introduced inlay hints, so I'm excited to use the new version. Unfortunately, the currently released version of this app only allows using the bundled 0.8.x nvim binary.

It would be nice to have a setting that allowed selecting a specific nvim binary to use as an override for the bundled version.

[timhatch]

The bundled nvim version in the app can be set using the release tag in the download/build nvim scripts. Or do you mean that you'd like to be able to use an external nvim version, e.g. /opt/homebrew/bin/nvim (or some other location).