Oversized ID tokens break oauth authentication

[cccs-nik]

Big ID tokens (eg. ID tokens with a big groups claim) will go over the 4KB cookie size limit and silently fail logging users in. I made a quick workaround that splits oversized tokens into chunks: main...cccs-nik:trino-gateway:token-chunks but maybe a more complex and appropriate solution would be to store tokens server-side. Perhaps ID tokens should also not be stored at all, but access tokens instead once authentication is done.