Improve node:vm implementation to avoid unnecessary throws

[petebacondarwin]

The current implementation throws "not implemented" errors on createContext and new Script.
This is a breaking change from how unenv and Node.js work.
Now they return instances that are safe since they don't have any implementation, or actually also throw "not implemented" errors for their methods.

This change will allow us to safely remove the node:vm polyfill from the Cloudflare unenv preset.

For reference:

• Node.js implementation
• unenv implementation

[vicb]

LGTM.

I think you can simplify the validation of the timeout by destructuring with a default value of 1

[petebacondarwin]

From what I can tell the internal build job failures are due to unrelated tests failing. It is not clear whether I can do something to fix these. I tried re-running them in case they were just flakes...