Re: [whatwg/dom] Define processing instruction attributes (PR #1454)

WebReflection left a comment (whatwg/dom#1454)

to whom it might concern, a quick polyfill for this is here https://github.com/ungap/processing-instruction/blob/main/index.js but I wonder just one thing: are attributes observed at the MutationObserver level too or it's just a side effect for the fact that the `data` changes?

I don't want to go too greedy at the MutationObserver level because between setting explicitly data and changing attributes is basically indistinguishable from a user-land prospective unless tons of slow boilerplate is implemented + I wonder if, separately, anyone would be interested in a quick TreeWalker that finds comment nodes and replaces these with processedInstructions before further usage (most notably the template one, but also `innerHTML` or similar operations), thank you and congrats for the merge and tests and whatnot.

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