* remote: add user key to config schema webhdfs
This was already supported according to documentation, but missing in
code
Fixes: 10062
* remote: add password key to support Basic Auth
* remote: add data_proxy_target for webhdfs remote
This key is needed to construct a potential rewrite dictionary in
webhdfs to deal with HDFS behind High Availability Proxy servers
* bump dvc-webhdfs
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Co-authored-by: skshetry <[email protected]>
