`fre run`: listing

[singhd789]

Is your feature request related to a problem? Please describe.
It would be helpful to list data set and information about the experiment (info could alos be used/passed to other fre run subtools)

• list .nc data files/datasets (fre list datasets)
• list available layouts associated with exp (fre list layouts)
• list available runtime experiments
• list namelist files associated with exp (fre list nml-file)
• list diag, data, and field tables (fre list tables --diag-table | --field-table | --data-table)