Node stream support

[vigoo]

Adds initial node:stream support based on the wasmedge-quickjs implementation (which is based on Deno).
As part of this, had to also add nextTick into node:process.

Note that this is the best approximation of Node's event loop that I could do without forking rquickjs but it is not perfect. We may need to further tweak it in the future.

wasm-edge's event loop (which is also QuickJS based but not using rquickjs) does the following:

• For each (Rust async future) poll of the runtime, it first "runs the event loop without IO"
• This consists of an inner loop that runs until the tick/immediate task queue becomes empty:
  • First runs QuickJS's own pending jobs
  • Then runs the tick tasks
  • Then runs the immediate tasks
  • If there were tick/immediate tasks, repeat
• Then it processes the "subtasks", which are async Rust futures

In wasm-rquickjs I could not add a separate nextTick queue in the middle of the event loop, so instead I am just using defer to enqueue them - this basically adds a task in the end of QuickJS's own queue. So the only difference between our and the wasmedge event loop is that QuickJS's internal microtasks' and the user-defined nextTick tasks's order is not strictly defined.