CLI help text cleanup

[LCVcode]

The following corrections need to be made to the CLI help text:

• [ ] Replace outdated != filter code with the correct ^=
• [ ] Update filter examples to demonstrate all available filter modes
• [ ] Change the tool description to be more descriptive
• [ ] Find an alternate way to display object type aliases

In the below sample of the current help text, you can see an example of the abbreviation list that needs to be changed. Ideally, this would show the most readable version of each object type ({charms, applications, units, machines, hostnames, ips}).

python3 jockey.py --help                                     
usage: jockey.py [-h] [--refresh] [-f FILE]
                 [{charms,charm,c,app,apps,application,applications,a,units,unit,u,machines,machine,m,address,addresses,ips,ip,i,hostnames,hostname,host,hosts,h}] [filters [filters ...]]

Jockey - All your Juju objects at your fingertips.

positional arguments:
  {charms,charm,c,app,apps,application,applications,a,units,unit,u,machines,machine,m,address,addresses,ips,ip,i,hostnames,hostname,host,hosts,h}
<truncated>

[johnlettman]

Would you be open to exploring the use of click and rich?

[LCVcode]

Those seem like cool options, thank you. I will definitely look into click as an alternative to argparse. Personally, I am not as excited about enhancing colors myself with rich, but I would be excited for someone else to do it. I will open a follow-up issue for that purpose after I made some changes to the CLI.

[LCVcode]

I am currently working on replacing argparse with click. I will likely change multiple files names as part of this work.