Optimize stream operations

[coyotte508]

Off the top of my head

• Use the byte utilities provided by creating a ReadableStream with {type: "bytes"} that avoid copying data to stream internals
• Avoid copying data when doing result.value = new Uint8Array([...leftoverBytes, ...result.value]);
• maybe check lz4 decompression performance & impact

This is to investigate, to see if any of those has any real impact