[community] [code] [connection] Investigate `*_file` functions in ssh.py for potential to add z/OS file tags

[ketankelkar]

The ssh connection plugin has functions put_file and fetch_file.

Determine if there's scope to handle tags for z/OS UNIX files.

• Perhaps put_file can tag the file after copying it to the destination.
• Perhaps fetch_file can read the tag to determine how to decode the file (and possibly convert it to utf-8)

The zos-util package contains python functions for checking extended file attributes, e.g.:

• tag_info = zos_util.get_tag_info(fpath)
• zos_util.chtag(fpath, 1047)

A potential concern may be raised that such changes will require new package imports. While true, those import(s) can be wrapped inside a conditional to even set a boolean variable is_zos_target

try:
  import zos-util
  is_zos_target: True #  import only succeeds for z/OS
except ImportException:
  is_zos_target: False

And now, function logic can leverage the is_zos_target boolean.