feat: deserializeAsync parse takes a ReadableStream Uint8Array as input

[Sheraff]

The goal is to better propagate streaming errors, which happens natively if we use the Response.body stream (might also in the future propagate backpressure).

This has pretty important drawbacks

• much more opinionated parse function: takes a stream and not any iterator
• types are lost going through the stream because we're forcing encoding as UInt8Array (this would happen normally through the network though, it's just an issue in the tests I think)
• we can't just take the output of stringify and pass it to parse (though stringify might also be changed to return a stream instead)