Authentication

SPQR currently supports these auth methods for backend auth:

trust, see Trust Authentication.
password, md5 and scram-sha-256, see Password Authentcation.

Methods supported for frontend auth, the way they`re specified in config:

ok, same as trust
notok, opposite to ok
clear_text, same as password
md5
scram, same as scram-sha-256

For more information about authentication config, see pkg/config/auth.go