Rust library with batteries included

[s-panferov]

In #1209 you introduced a deno crate which allows creating and working with a basic Isolate. This is definitely usable, but it would be very helpful to have the ability to "turn on" Deno's standard library from the cli package to be available in deno crate too.

My use case: I'm trying to build a FaaS on top of Deno, and I would like to have some parts of the cli package available in deno crate:

1. The TypeScript compiler
2. Fetch
3. Timers

But it would be useful to be able to turn on everything selectively.

[s-panferov]

Github created two issues somehow, closing this in favor of #2633