repl: define import.meta.main and import.meta.url

[kitsonk]

When checking something quickly in the REPL, like creating a new URL, it would be handy if import.meta.main and import.meta.url were accessible and assigned values.

[bartlomieju]

I guess it makes sense, even though REPL is not really a module context. import.meta.resolve() should work as well in such case.

[kitsonk]

It isn't, but we support both import statements and dynamic import in the non-module context. Especially when you want to copy pasta something quickly to see if the logic works, we have added a lot of stuff to make that happen.