This connects to SB, authenticates and gets a session token for communicating with SB. If you do not supply a username or password, you will be prompted to enter them.
authenticate_sb(username, password)
Sciencebase username
Sciencebase password, prompts user if not supplied and
no password is returned by `keyring::key_get("sciencebase", username)`.
See keyring-package
documentation for more details.