jira: add support for personal access tokens

[valentijnscholten]

JIRA Server 8.14 and later can use personal access tokens to authenticate against the API instead of passwords.
Passwords via basic authentication will be deprecated, so we should support this new authentication method.

We are using the jira package for python, so filed an upstream feature request: pycontribs/jira#993

Please note these personal access tokens are slightly different from the JIRA Cloud api tokens (thank you atlassian).

Cloud: curl -H "Authorization: Basic <base64(<username>:<yourToken>>)" https://{jiraBaseUrl}/rest/api/

Server: curl -H "Authorization: Bearer <yourToken>" https://{jiraBaseUrl}/rest/api/

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[mattmedus]

Hi, I'm trying to integrate DD with Jira Server through personal access token. Is this possible?