Bring over `serve-local` option from code-server preview to new `code tunnel` command

[srudolph-credera]

The preview of VS Code Server (https://code.visualstudio.com/blogs/2022/07/07/vscode-server#_a-preview-of-a-larger-journey) had a subcommand that enabled running locally:

serve-local: Start a VS Code Server that can be accessed locally

I would love to see this option brought into the new code tunnel command introduced this week (https://code.visualstudio.com/blogs/2022/12/07/remote-even-better). This feature supports a variety of useful edge cases like connecting to a web version of VS Code running on the local private network or inside a secure cloud environment where authentication is either not required or already independently addressed.