[Tailscale] Add netcheck command

[itsmatteomanf]

Description

This PR adds the Netcheck command for the Tailscale extension.

Screencast

Checklist

• I read the extension guidelines
• I read the documentation about publishing
• I ran npm run build and tested this distribution build in Raycast
• I checked that files in the assets folder are used by the extension itself
• I checked that assets used by the README are placed outside of the metadata folder

[raycastbot]

Thank you for your first contribution! 🎉

🔔 @samlinville @rosszurowski @itsmingjie @erics118 @brandenwagner @j3lte you might want to have a look.

You can use this guide to learn how to check out the Pull Request locally in order to test it.

You can expect an initial review within five business days.

[pernielsentikaer]

Thanks for your contribution 🔥

@samlinville do you want to check this?

[raycastbot]

This pull request has been automatically marked as stale because it did not have any recent activity.

It will be closed if no further activity occurs in the next 7 days to keep our backlog clean 😊

[itsmatteomanf]

I see it's marked as stale, but I can't do anything about it... can someone take a look and approve?