formula: add clap completion style

[daeho-ro]

• 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?

---

Add :clap shell parameter format for rust binaries with the clap_complete crate as documented here.

• https://docs.rs/clap_complete/4.5.39/clap_complete/env/index.html

Related issue:

• jujutsu: enable dynamic shell completions homebrew-core#200162

I have skipped for tests, it depends on the external one same as :click case.

[MikeMcQuaid]

Makes sense to me, thanks @daeho-ro!