feat: getSession force refetch option

[LouisHaftmann]

Adds a force option to getSession. Useful when token cookie has been updated by an external api route (not handled by nuxt-auth's signIn/signOut) because the token in useAuthState would still be undefined/null after manually calling a register api route for example.

[BracketJohn]

Thanks for this contribution ❤️ Please also extend the docs with the new config option and we are good to go (:

[BracketJohn]

Almost there:

• I should've let you know: You have to change the docs of v0.6 as this is the version that will receive this feature. They are located at docs/v0.6/ - can you move your changes there?
• your changes only effect the local-provider - when you move your doc-changes to the docs/v0.6 part, it should also be clearer, that this is the case

[zoey-kaiser]

LGTM

Outdated.