[whatwg/streams] Meta: update repository files (#1034)

See https://github.com/whatwg/spec-factory for details.

(I know this is currently not a good change as-is, I'll undo some of the changes in a follow-up commit and they can be squashed afterwards, but it's probably good to be aware of the differences from the norm and to see to what extent we can harmonize.)
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/1034

-- Commit Summary --

  * Meta: update repository files

-- File Changes --

    M .editorconfig (12)
    M .gitignore (7)
    M .pr-preview.json (12)
    M Makefile (11)
    A PULL_REQUEST_TEMPLATE.md (15)

-- Patch Links --

https://github.com/whatwg/streams/pull/1034.patch
https://github.com/whatwg/streams/pull/1034.diff

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