Allow deserialising token in is_valid_token
This MR adds support for passing serialised tokens to igwn_auth_utils.scitokens.is_valid_token
as a convenience for the user, partially implementing #11 (closed).
This MR adds support for passing serialised tokens to igwn_auth_utils.scitokens.is_valid_token
as a convenience for the user, partially implementing #11 (closed).