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Implement promise bindings This implements support for using Promises in WebIDL, executing promise callbacks in batches (equivalent to running all enqueued jobs from a setTimeout(0)), and attaching native callbacks to promise objects. This is the combined work of myself, @dati91, and @mmatyas based on the following prior work in Gecko: * Codegen.py * Promise.webidl * Promise.cpp/Promise.h * PromiseNativeHandler.h This does not implement microtasks per #4283. This allows us to make progress on testing code that requires the use of Promises right now; the microtasks work is more complicated, but also largely orthogonal to implement. Requires https://github.com/servo/mozjs/pull/89, https://github.com/servo/rust-mozjs/pull/287, and https://github.com/servo/rust-mozjs/pull/294. --- - [X] `./mach build -d` does not report any errors - [X] `./mach test-tidy` does not report any errors - [X] These changes fix #4282 - [X] There are tests for these changes <!-- Reviewable:start --> --- This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/12830) <!-- Reviewable:end -->