CDN Example: Add integrity metadata map and SRI hashes + Github Action to update

[magicmark]

This reference implementation will likely be copied and pasted in a bunch of places.

SRI hashes are important when loading from CDNs, so hopefully this improves security in a bunch of places :)

(I've verified manually this file still works)

I've also set up a github action to regenerate the example when:

• on the released action for updated internal deps
• scheduled cronjob for when external deps update

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[connorshea]

Holy crap thank you, I was so frustrated trying to put this together myself when trying to integrate GraphiQL into my app where I use SRI for everything else. I hope this gets merged.

[jonathanawesome]

LGTM, thanks @magicmark!

[trevor-scheer]

This is excellent, thanks! Once I've got permissions sorted on this repo I'll get this merged. I literally just opened a related issue.