[whatwg/webidl] Add Float16Array (PR #1398)

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The [Float16Array](https://github.com/tc39/proposal-float16array) proposal for JavaScript adds a new TypedArray type holding IEEE binary16 floats. This PR adds it to all of the lists of TypedArray types in WebIDL.

Implementations of the proposal are underway in at least [Chrome](https://bugs.chromium.org/p/v8/issues/detail?id=14012) and [Firefox](https://bugzilla.mozilla.org/show_bug.cgi?id=1833646), though it'll be some time before they're shippable. I don't know what the appropriate time to merge this is but I figured I should at least open it.

This is a JS feature, but adding it to ArrayBufferView has implications for any API which takes a generic TypedArray, which is quite a few of them. Does that imply they all need new tests? Hopefully not?

Fixes https://github.com/whatwg/webidl/issues/1310.

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You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/webidl/pull/1398

-- Commit Summary --

  * Add Float16Array

-- File Changes --

    M index.bs (11)

-- Patch Links --

https://github.com/whatwg/webidl/pull/1398.patch
https://github.com/whatwg/webidl/pull/1398.diff

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