[w3c/FileAPI] Define chunk size for `ReadableStream` created by `blob::stream()` (#144)

Currently regarded as 'Issue 1' I have recently come across a project that forces me to assume the chunk size for the stream. Testing with chromium and firefox, the chunk size appears to be `0x10000` or `65536`. I cannot find a reason why it's this particular number.

As I'm making a wasm module, I must allocate memory space when going through files 5GB+ in size. I will allocate `0x10000` bytes for now, but only out of assumption... if there's a browser out there that does not follow this assumption then there will be fatal bugs.

I'm not sure if this is w3c/FileAPI/'s or streams.spec.whatwg.org's jurisdiction. But neither of them has an exact number.

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