Merge branch 'ynl-cli-list-attrs-argument'

Gal Pressman says:

====================
YNL CLI --list-attrs argument

While experimenting with the YNL CLI, I found the process of going back
and forth to examine the YAML spec files in order to figure out how to
use each command quite tiring.

The addition of --list-attrs helps by providing all information needed
directly in the tool. I figured others would likely find it useful as
well.

v1: https://lore.kernel.org/all/20251116192845.1693119-1-gal@nvidia.com/
====================

Link: https://patch.msgid.link/20251118143208.2380814-1-gal@nvidia.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>