feat(completion): add zsh support

[chenrui333]

📝 Description

• feat(completion): add zsh support

✔️ How to Test

unit test

---

relates to Homebrew/homebrew-core#170570

[jriddle-linode]

You should be able to convert the bash completions using bashcompinit in zsh without having to make another completion config

[lgarber-akamai]

@chenrui333 I think we're planning on cutting a patch to get only #608 out given this PR will need a bit more vetting/testing. Will that work for you?

[chenrui333]

yeah, that works for me.

[lgarber-akamai]

I'm seeing some weird outputs attempting to autocomplete on subcommands:

linode-cli linodes list\ create\ view\ update\ delete\ backups-list\ snapshot\ backups-cancel\ backups-enable\ backup-view\ backup-restore\ boot\ clone\ configs-list\ config-create\ config-view\ config-update\ config-delete\ config-interfaces-list\ config-interface-add\ config-interface-view\ config-interface-update\ config-interface-delete\ config-interfaces-order\ disks-list\ disk-create\ disk-view\ disk-update\ disk-delete\ disk-clone\ disk-reset-password\ disk-resize\ firewalls-list\ ips-list\ ip-add\ ip-view\ ip-update\ ip-delete\ migrate\ upgrade\ nodebalancers\ linode-reset-password\ reboot\ rebuild\ rescue\ resize\ shutdown\ transfer-view\ volumes\ types\ type-view\ --help

Dropping the quotes here seems to resolve the issue on my end 👍

Suggested change

	'$actions --help'
	'$actions --help'

[lgarber-akamai]

@zliang-akamai Just to save you a bit of time for when you review this PR, I tested this PR with oh-my-zsh using the following:

make install
linode-cli completion zsh > ~/.oh-my-zsh/completions/_linodecli
compinit