Feature: ability to fuzzy filter options by 'required' status

It would be awesome to use fuzzy filtering on the aws cli commands to see which options are required.

For example, when running `ec2 create-key-pair`, the `--key-name` option is required. I can filter the list of auto-completed options by typing `name` and getting just the `--key-name` option:

However, I can't fuzzy filter by using `required`:

This would be an awesome feature, as you could immediately know which options are required for any command you are running.