Note that it's not actually executing tasks in parallel, it's still
throwing them on the HTML event loop task queue, each with its own
unique task source.
This makes our fetch implementation a lot more robust when HTTP caching
is enabled, and you can now click links on https://terminal.shop/
without hitting TODO assertions in fetch.
This implements enough of the Geolocation spec that it is now possible
for websites to retrieve the current geo position or try to watch for
updates (which currently never happen).
As it stands now, it only returns a single emulated position that points
to San Francisco.
The WebSocket spec tells us to queue tasks instead of firing events
synchronously at WebSockets, so this commit does exactly that.
The way we've implemented web sockets means that the work is spread
across multiple libraries and even processes, which is why it doesn't
look like the spec verbatim.
Resulting in a massive rename across almost everywhere! Alongside the
namespace change, we now have the following names:
* JS::NonnullGCPtr -> GC::Ref
* JS::GCPtr -> GC::Ptr
* JS::HeapFunction -> GC::Function
* JS::CellImpl -> GC::Cell
* JS::Handle -> GC::Root
