Terminate 3rd party session after log out

[infomiho]

After a user logs out in Wasp, for some OAuth providers, it's necessary to terminate the 3rd party session as well. We could do this as a generic "log out clean up" hook that we perform for some of the OAuth providers e.g. Keycloak needs this. We would need to improve our log out action to send a request to the server on log out as well.

Related Discord question: https://discord.com/channels/686873244791210014/1283013159598428181/1283013159598428181

[infomiho]

1. Wasp should send a /logout request from the client to the server to log out the user (invalidate the session in the DB)
2. Wasp should (for some providers) have some extra logic e.g. doing some API calls to the provider

• This requires us to know which provider was used with which session.