feat: cli command for enabling or disabling an extension

[imorland]

Changes proposed in this pull request:
Adds a new CLI command to enable toggling of a given extension.

Usage:

 php flarum extension:enable blomstra-turnstile

 php flarum extension:disable blomstra-turnstile

Reviewers should focus on:

Screenshot

Necessity

• Has the problem that is being solved here been clearly explained?
• If applicable, have various options for solving this problem been considered?
• For core PRs, does this need to be in core, or could it be in an extension?
• Are we willing to maintain this for years / potentially forever?

Confirmed

• Frontend changes: tested on a local Flarum installation.
• Backend changes: tests are green (run composer test).
• Core developer confirmed locally this works as intended.
• Tests have been added, or are not appropriate here.

Required changes:

• Related documentation PR: (Remove if irrelevant)
• Related core extension PRs: (Remove if irrelevant)

[SychO9]

This is neat! Thanks! some comments.

[askvortsov1]

Are we planning to eventually add some kind of "enable/disable all" to this, or would that (and bisection) be a separate command?

[askvortsov1]

I feel like an if/else would suffice here? I don't see how we're going to get any more cases than that.

[SychO9]

honestly true, I've been using the php8 match so often lately that my brain tries to produce something similar 😆

[askvortsov1]

Ah yes, pattern matching is indeed wonderful!

suspiciously drops https://ocaml.org/docs/data-types on the way out

[SychO9]

Are we planning to eventually add some kind of "enable/disable all" to this, or would that (and bisection) be a separate command?

The enabl/disable all could be eventually part of this same command I think, we'd probably use an all argument or --all option.

The bisect should be its own command imo