Begin porting non-dev commands to use AbstractCommand

[dduugg]

• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same change?
• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes? Here's an example.
• Have you successfully run brew style with your changes locally?
• Have you successfully run brew typecheck with your changes locally?
• Have you successfully run brew tests with your changes locally?

---

The latest release moved all the dev commands to using AbstractCommand. Since we (er, I) haven't seen any reported issues, let's start porting the non-dev commands.

(There's a bonus commit here, where i realized that require "cli/parser" should be in AbstractCommand, not its subclasses, which no longer reference the parser directly.)

Relates to #16814
See also #16938 &c.

[apainintheneck]

Great work on porting all of these commands over!

[MikeMcQuaid]

Looks good, thanks again @dduugg!