sveltekit-firebase-adapter

This is a fork of simonnepomuk's adapter for my own use, but if it's useful for others, feel free to use it.

Changelog

feat: added node 18 & 20 to the nodeVersion option.
feat: added some extra dependencies that seemed to be missing to the generated package.json.
fix: cors being stringified to '{}'.
fix: install of dependencies in functions directory.
feat: add autoInstallDeps flag in options to be able to toggle off automatic install of dependencies in functions directory.
fix: use req.rawBody instead of req.body when creating new Request instance as firebase functions automatically parse the body using bodyParser based on the content-type. Was causing errors where if the content-type was application/json, the request body would evaluate to '[object Object]'.