[w3c/gamepad] Add buttondown, buttonup, buttonchange, axischange events (#152)

Closes #4

Closes #???

The following tasks have been completed:

 * [ ] Modified Web platform tests (link to pull request)

Implementation commitment:

 * [ ] WebKit (https://bugs.webkit.org/show_bug.cgi?id=)
 * [ ] Chromium (https://bugs.chromium.org/p/chromium/issues/detail?id=)
 * [ ] Gecko (https://bugzilla.mozilla.org/show_bug.cgi?id=)


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<a href="https://pr-preview.s3.amazonaws.com/w3c/gamepad/pull/152.html" title="Last updated on Jun 10, 2021, 11:06 PM UTC (04884c3)">Preview</a> | <a href="https://pr-preview.s3.amazonaws.com/w3c/gamepad/152/baaa353...04884c3.html" title="Last updated on Jun 10, 2021, 11:06 PM UTC (04884c3)">Diff</a>
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/gamepad/pull/152

-- Commit Summary --

  * Add buttondown, buttonup, buttonchange, axischange events

-- File Changes --

    M index.html (402)

-- Patch Links --

https://github.com/w3c/gamepad/pull/152.patch
https://github.com/w3c/gamepad/pull/152.diff

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https://github.com/w3c/gamepad/pull/152