Allow passing fsspec options to WebHDFS to enable Kerberos and https

[gudmundur-heimisson]

After #6662 it is no longer possible to use custom hdfscli clients with WebHDFS, as a result we are no longer able to connect using Kerberos or HTTPS.

fsspec allows passing in options to enable kerberos and https, we simply need to pass them through and expose them in the DVC config file:
https://filesystem-spec.readthedocs.io/en/latest/_modules/fsspec/implementations/webhdfs.html

This would also be an opportunity to remove the no longer used hdfscli options.