Add support for Cookie authorization

[ereOn]

Right now gouqi support basic and bearer authentication methods, but Jira actually also supports Cookie-based authentication.

Our organization sadly only allows cookie-based auth. even in an automated context... Would you be willing to accept a PR that adds support for this? I could tackle this fairly quickly if you agree that this would be a nice addition.

[avrabe]

Yes, would be more than happy adding also cookies as authentication method