Re: [whatwg/dom] Consider adding AbortController.prototype.follow(signal) (#920)

@wanderview just to add to what you're saying, when you [follow](https://source.chromium.org/chromium/chromium/src/+/master:third_party/blink/renderer/modules/cache_storage/cache.cc;l=1089;drc=ae1a631ceaf488f5e9cb55755de32b6a505b4b1e) you basically use the capability we're asking for that isn't exposed to userland.

In userland, you can't chain signals in a way that doesn't require `addEventListener` which means the parent signal always holds a reference to the child controller (which can live for much longer) - this is the memory leak we've run into :]

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