Support FTP as a connection protocol

[pjfarleyiii]

Currently the zowe-client-python-sdk only supports a zOSMF connection/interface. In environments where zOSMF access is not (or not yet) available but FTP access IS available, both zowe Explorer and the zftp plugin of the zowe CLI support access via FTP.

As of now, we cannot use the zowe-client-python-sdk functions when the only z/OS connection interface available is FTP.

Please support z/OS connection access similar to the zftp CLI plugin.

The only current alternative is to run zowe zftp commands as external processes, either via python system() or better with a python subprocess.run() setup to capture results inside the python program directly.

[github-actions]

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