`Promise.allKeyed` and `Promise.allSettledKeyed ` testing plan

Test plan for https://tc39.es/proposal-await-dictionary/ ([issue 18](https://github.com/tc39/proposal-await-dictionary/issues/28)) Boilerplate: - [ ] Property descriptors - [ ] Function lengths - [ ] Function names - [ ] Are not constructors - [ ] prototypes are Function.prototype - [ ] are extensible Success cases: - [ ] Object with no keys - [ ] Object with no enumerable properties - [ ] Promises already resolved before call - [ ] Promises resolve after call - [ ] Resulting key order matches original order (not the order promises settled) - `Promise.allSettledKeyed` - [ ] All promises reject - [ ] All promises fullfilled - [ ] Mix of rejected and fullfilled Failure cases: - Testing `newPromiseCapability` - [ ] Receiver is not a constructor - [ ] Constructor throws - [ ] Constructor does not provide a 'resolve' and 'reject' function - Testing `GetPromiseResolve` - [ ] Receiver does not have a `.resolve` function - [ ] Not passing an object as the argument - `Promise.allKeyed` - [ ] The first promise to settle is rejected - [ ] The second promise to settle is rejected - [ ] The last promise to settle is rejected Other edge cases: - [ ] Synchronous thenables to cover `PerformPromiseAllKeyed` step 8 - [ ] calling `promiseResolve` throws - [ ] `promiseResolve` does not return a _thenable_ - [ ] Exotic object where `[[OwnPropertyKeys]]` throws - [ ] Exotic object where `[[GetOwnProperty]]` throws - [ ] Exotic object where `[[GetOwnProperty]]` returns `undefined`