[whatwg/streams] Meta: fix realm issues in reference implementation testing setup (#957)

By bundling together the reference implementation using browserify, then evaluating it inside the wpt-runner window context, we fix all the cross-realm issues that have plagued us. This includes promise assimilation (which we had a workaround in place for), as well as Object.prototype identity (came up when testing async iterators) and the presence of DOMException and AbortSignal on the global (came up when testing #744).
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/957

-- Commit Summary --

  * Meta: fix realm issues in reference implementation testing setup

-- File Changes --

    M reference-implementation/.eslintrc.json (6)
    A reference-implementation/lib/index.js (16)
    M reference-implementation/package.json (7)
    M reference-implementation/run-web-platform-tests.js (79)

-- Patch Links --

https://github.com/whatwg/streams/pull/957.patch
https://github.com/whatwg/streams/pull/957.diff

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