Add async iteration test & move core-js types for pure version to correct folder

Author: slowcheetah

packages/core-js-types/src/base/core-js-types/async-iterator-object.d.ts

@@ -0,0 +1,8 @@
+/// <reference types="./async-iterator" />
+/// <reference types="../proposals/symbol" />
+
+declare namespace CoreJS {
+  export interface CoreJSAsyncIteratorObject<T, TReturn = unknown, TNext = unknown> extends CoreJS.CoreJSAsyncIterator<T, TReturn, TNext> {
+    [CoreJS.CoreJSSymbol.asyncIterator](): CoreJSAsyncIteratorObject<T, TReturn, TNext>;
+  }
+}

…c/base/core-js-types/async-iterable.d.ts …e/pure/core-js-types/async-iterable.d.tspackages/core-js-types/src/base/core-js-types/async-iterable.d.ts renamed to packages/core-js-types/src/base/pure/core-js-types/async-iterable.d.ts packages/core-js-types/src/base/core-js-types/async-iterable.d.ts renamed to packages/core-js-types/src/base/pure/core-js-types/async-iterable.d.ts

@@ -0,0 +1,11 @@
+/// <reference types="./promise" />
+
+declare namespace CoreJS {
+  export interface CoreJSAsyncIterator<T, TReturn = any, TNext = any> {
+    next(...[value]: [] | [TNext]): CoreJS.CoreJSPromise<IteratorResult<T, TReturn>>;
+
+    return?(value?: TReturn | PromiseLike<TReturn>): CoreJS.CoreJSPromise<IteratorResult<T, TReturn>>;
+
+    throw?(e?: any): CoreJS.CoreJSPromise<IteratorResult<T, TReturn>>;
+  }
+}