We were previously only returning the controllers current
[[byobRequest]] instead of taking into account pending pull intos.
Rename the getter function which would return the controllers
[[byobRequest]] slot to `raw_byob_request` to differentiate it from
the IDL getter.
This also leaves a FIXME for a spec step which we are also not currently
implementing correctly.
With this change, we now have ~1200 CellAllocators across both LibJS and
LibWeb in a normal WebContent instance.
This gives us a minimum heap size of 4.7 MiB in the scenario where we
only have one cell allocated per type. Of course, in practice there will
be many more of each type, so the effective overhead is quite a bit
smaller than that in practice.
I left a few types unconverted to this mechanism because I got tired of
doing this. :^)
