[feature] Allow description of action in the commands omni bar

[iamashwin99]

Currently the shortcut : opens an omnibar with a few commands.
Could we allow typing the explanation of actions (shortcuts) like Go to first activated tab, Go up one path in the URL, Close tab on left , Go back in history, Go to edit box with vim editor ... and other actions on this omni bar which brings a drop down list of these actions and pressing enter on them does the action. This would be helpful when you know an action exits and you know what it is called but forgot the keyboard shortcut. The drop down list could also give a hint of the keyboard shortcut corresponding to the listed actions.

The idea is similar to how command Pallet works in vscode for eg:

We could perhaps also have at the top the last used action used in this command bar ( not necessarily the same one in .) like in vscode.