Adds the builtin Trace and IsTraceCategoryEnabled functions
exposed via extra bindings. These are intended to use by
embedders to allow basic trace event support from JavaScript.

```js
isTraceCategoryEnabled('v8.some-category')

trace('e'.charCodeAt(0), 'v8.some-category',
      'Foo', 0, { abc: 'xyz'})
```

Bug: v8:7851
Change-Id: I7bfb9bb059efdf87d92a56a0aae326650730c250
Reviewed-on: https://chromium-review.googlesource.com/1103294
Commit-Queue: Yang Guo <yangguo@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Reviewed-by: Fadi Meawad <fmeawad@chromium.org>
Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54121}