[w3c/push-api] Add bytes() method for reading bytes into a Uint8Array (PR #369)

The Fetch API [is getting](https://github.com/whatwg/fetch/pull/1753) a `Uint8Array`-returning `bytes()` method alongside its existing `arrayBuffer()` method, following [the principle](https://github.com/w3ctag/design-principles/pull/480) that APIs should generally vend byte buffers as `Uint8Array`s.

This PR makes the same change for `PushMessageData`, which has its own distinct `arrayBuffer` method.

I'm assuming this is uncontroversial given the support from the three major implementations for doing this on `Body`, but I can open an issue and solicit explicit support separately if you'd prefer. I'll write tests if I get a signal that this is able to go forward.

It's unfortunate that `getKey` and `applicationServerKey` vend `ArrayBuffer`s instead of `Uint8Array`s, but it's too late to fix those now.

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

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


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

  https://github.com/w3c/push-api/pull/369

-- Commit Summary --

  * Add bytes() method for reading bytes into a Uint8Array

-- File Changes --

    M index.html (6)

-- Patch Links --

https://github.com/w3c/push-api/pull/369.patch
https://github.com/w3c/push-api/pull/369.diff

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