Split streams into more features

[MattiasBuelens]

Prompted by the discussion in web-platform-tests/wpt#49829, I had a look at the current list of features in the streams group. Currently, there's only the "base" streams feature and a single async-iterable-streams extension for async iteration. However, there have been several additions over the years since we shipped BYOB support:

• Transferable streams, added to the standard in August 2020 and shipped in Chrome 87 and Firefox 103
• ReadableStream.from(asyncIterable), added to the standard in June 2023 and shipped in Firefox 117
• Transformer.cancel(), added to the standard in September 2023 but not yet shipping in any browser
• ReadableStreamBYOBReader.read(view, {min}), added to the standard in November 2023 and shipped in Firefox 134

I suggest we add the following new features, and move them out of the base streams feature:

• transferable-streams
• readablestream-from
• transformstream-transformer-cancel
  • There isn't a BCD feature for this yet, but I'm working on adding one: Add transformer.cancel method to TransformStream constructor mdn/browser-compat-data#25519
• readablestreambyobreader-read-min

[MattiasBuelens]

@jcscottiii FYI