[heycam/webidl] Add bigint type (#525)

This patch adds a bigint type to WebIDL with the following properties:
- bigint corresponds directly to BigInt
- The conversion from JS is based on ToBigInt, namely it throws on Number.
- bigint is not grouped as a "numeric" type, as this category is often
  used to refer to types which have a JavaScript representation of Number.
- bigint is included in the overloading resolution algorithm, and it's
  possible to overload a function for BigInt and numeric arguments.

Although it may be on the early side for such a change, the lack of
BigInt WebIDL integration is already coming up in some designs for integrating
BigInt with the Web Platform, such as https://github.com/w3c/IndexedDB/pull/231
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/525

-- Commit Summary --

  * Add bigint type

-- File Changes --

    M index.bs (88)

-- Patch Links --

https://github.com/heycam/webidl/pull/525.patch
https://github.com/heycam/webidl/pull/525.diff

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