fix: sanitize session data to prevent max cookie size issue

[rphlmr]

Should fix https://github.com/mitchelvanbever/remix-auth-supabase/issues/15

With some OAuth provider, we hit the 4kb cookie size limit due to huge Supabase Session datas.

I propose to sanitize what I think is useless data. (session.user?.identities ==> list off all supabase identites linked to the user, I guess)

Open to discuss :p

[rphlmr]

Can be replaced by https://github.com/mitchelvanbever/remix-auth-supabase/pull/20

[mitchelvanbever]

Closing in favor of #20