When a "length-tracking" TypedArray/DataView is postMessage'd, the
view seen by the recipient should still be "length-tracking". However,
this wasn't the case, because the actual length was serialized, as
opposed to the JS::ByteLength, which includes the "auto" state to
signal the presence of this "length-tracking" behavior.
This fixes two subtests in...
https://wpt.live/html/infrastructure/safe-passing-of-structured-data/messagechannel.any.html
We treat any mention of [[ArrayBufferByteLengthData]] and related
atomic operations as FIXMEs to be fixed at a later date. We also add the
HostGrowSharedArrayBuffer abstract operation, which will be overridden
by LibWeb to grow shared WebAssembly memories.
To make {,de}serialization of ImageBitmap work we also had to add
support for creating an ImageBitmap from a HTMLCanvasElement in
WindowOrWorkerGlobalScopeMixin::create_image_bitmap_impl().
