Add the possibility to name custom keyboard shortcuts

[simjnd]

Problem

With Flatpaks becoming so prominent in elementary, just displaying the terminal command to execute may not be explicit enough

Proposal

Instead of making the user scroll through the entire command to figure out what it does it could be great to add a "Name" field so I could name by Super + B 'Bitwarden', and my Super + C 'Clips'

Prior Art (Optional)

No response

[cassidyjames]

There might be overlap with #161 here as well, if the intent is to actually add apps; we could be much smarter than just having to type a Terminal command, and could actually offer up the installed apps.