Add %JSONParse% for Fetch et al

[annevk]

Fixes #1012.

[ljharb]

Seems legit

[annevk]

Not mentioning it in prose was modeled after %Int32ArrayPrototype%, though I notice that for %ObjProto_valueOf% we do mention it in prose:

This function is the %ObjProto_valueOf% intrinsic object.

The latter probably also has an ID therefore. Was not mentioning the former an oversight?

(I also noticed some other inconsistencies for which I'll submit a separate PR.)

[ljharb]

I was wondering about that; I think it's better to have a dual link, and to mention it in both places (for all intrinsics).

[annevk]

Added here for JSON.parse. Per https://tc39.github.io/ecma262/#sec-well-known-intrinsic-objects there's quite a few not linked. I'm happy to file a follow-up issue for those, but I'm not going to work on a PR for now.

[domenic]

See #1012 (comment) for a potential slightly cleaner alternative. But either will work. I'll try to ask @bterlson in person today.

[bterlson]

I selfishly prefer this approach as it's cleaner in 262.