Ref/request response

[Mxchaeltrxn]

@haydn Closes #150.

What I've done

I've done everything mentioned on #150 except for the last one, which says

Update the sketchbook_response:measure request to have a layer field

The reason I've left this out is because I'm not entirely sure what this means (or what it's for). It also isn't in sync with the protocol specific in #149. Maybe you can clarify this a bit in this PR?

Some other notes:

• I've also added the request property to the protocol messages.
• I've removed the removeEventListener on line 26 of useCanvasConnection.js because according to the protocol, the sketchbook_response:acknowledge response should listen more than once for sketchbook_request:ping requests (in case of canvas disconnection, for example).
• On line 87 and 89 of useCanvasConnection.js, I've used a different id to avoid any confusion between the ids even though they can technically be the same since they're unrelated.

[vercel]

This pull request is being automatically deployed with Vercel (learn more).
To see the status of your deployment, click below or on the icon next to each commit.

🔍 Inspect: https://vercel.com/sketchbook-js/sketchbook/4rG1FxdqnfxLkma2hfumq1rsz7hn
✅ Preview: https://sketchbook-git-ref-requestresponse-sketchbook-js.vercel.app