feat: allow users to define custom session factory + types

[danielroe]

Questions

1. should onSuccess be fully optional (as in this implementation)?
2. would we instead like to require onSuccess (e.g. for redirect) but also always use the defined session factory for setting user session?
3. we should investigate type issues with @nuxt/ui-pro in playground (run pnpm test:types:playground to see them)

[atinux]

should onSuccess be fully optional (as in this implementation)?

We should make it required as best practice and avoid doing hidden stuff

would we instead like to require onSuccess (e.g. for redirect) but also always use the defined session factory for setting user session?

Not sure to understand the defined session factory you mean

For UI Pro types, I think it comes from Nuxt 3.8.1, @benjamincanac is working on it

[danielroe]

so I guess the question is whether we just run the session handler in defineSession + automatically do setUserSession?