function designed to create, initialize and return a new PostGresAuthenticator object.

set the auth table information.

set the database name the authenticator will use.

set the hasher the authenticator will use when comparing passwords and hashes.

set the username/password headers the authenticator should read from the metadata.

set the database host.

set db user.

set the database name the authenticator will use.

set SSL usage for connection.

set connection timeout.

set db user.