Hammer CLI

The --fields option accepts field names or predefined sets. it is not clear what values are available and what fields are printed for specific sets.

I'd love to see some help extension when --fields is defined on the command showing e.g. table like:
currently it is not visible for a user what fields are in which sets. I'd love to see some help extension when --fields is defined on the command showing e.g. table like:

Options:
  --fileds    FIELDS  Show specified fileds or predefined filed sets only. (See below)

...

Predefined field sets:
+--------+-----+---------+------+
| Fields | ALL | DEFAULT | THIN |
+--------+-----+---------+------+
| Id     |  x  |    x    |  x   |
| Name   |  x  |    x    |  x   |
| Param1 |  x  |    x    |      |
| Param2 |  x  |         |      |
+--------+-----+---------+------+

See more context in https://github.com/theforeman/hammer-cli/pull/276#issuecomment-452133084