zowex: Support `--response-format-json` option on all commands

[t1m0thyj]

It would be nice if zowex supported a --response-format-json (--rfj) argument across all commands like Zowe CLI does.

Also for commands that return tabular data (e.g. zowex ds ls), there is currently code duplication that could be reduced by adding a class similar to Imperative's IHandlerFormatOutputApi.

Rather than requiring each command handler to have separate branches of code for handling table/CSV/JSON output, the rows/columns should be stored in a single structure in memory, and passed to a common format method:
format(TABLE_DATA *data, FormatType format, std::string &output)

[t1m0thyj]

The readability of the table view (default output format of zowex) could be improved by displaying a header row like Zowe CLI does.