Add support for delegation-style token authentication

[jbaiera]

As we begin work on adding support for Kerberos auth to Elasticsearch by means of SPNEGO over HTTP, a question arises for how we will continue to authenticate inside the worker tasks of a running job. Elasticsearch supports token authentication, and as that is updated to allow for more authentication styles to retrieve tokens, we should add the ability to acquire, refresh, broadcast, and cancel tokens as part of the job initialization steps for the connector in distributed environments.

[jbaiera]

Waiting on elastic/elasticsearch#34383

[jbaiera]

This has long been closed. See #1175