Allow users to install `copilot` without installing NodeJS

[RyanHecht]

Describe the bug

Today, installing GitHub Copilot CLI requires the user to install and manage NodeJS versions, which isn't a great experience for inexperienced users.

Expected behavior

One idea is that perhaps copilot could be distributed as a single executable binary, which essentially distributes NodeJS along with the application logic and dependencies. If successful, it would lower the barrier to using copilot and allow use of release assets.

[kapitanluffy]

+1 to this 👍

[staffanf]

Yes, or why not a simple docker container so you could put something like this in .zhsrc:

alias ghcop='docker run --rm -ti -v ~/.copilot:/something github/copilot-cli'

EDIT: Created #55