Stickies: sticky notes as a surface (heavyweight version)

[TodePond]

This PR implements sticky notes as a surface in a more heavyweight way. It adds a new StickingManager that lets us handle sticking on a shape-by-shape basis. The code is messy and work-in-progress.

2024-03-27.at.16.14.10.-.Ivory.Wolverine.mp4

2024-03-27.at.16.18.12.-.Teal.Bison.mp4

2024-03-27.at.16.21.47.-.Turquoise.Amphibian.mp4

2024-03-27.at.16.26.13.-.Blue.Alpaca.mp4

2024-03-27.at.16.38.40.-.Rose.Hare.mp4

2024-03-27.at.16.50.14.-.Tan.Limpet.mp4

Change Type

• sdk — Changes the tldraw SDK
• dotcom — Changes the tldraw.com web app
• docs — Changes to the documentation, examples, or templates.
• vs code — Changes to the vscode plugin
• internal — Does not affect user-facing stuff

• bugfix — Bug fix
• feature — New feature
• improvement — Improving existing features
• chore — Updating dependencies, other boring stuff
• galaxy brain — Architectural changes
• tests — Changes to any test code
• tools — Changes to infrastructure, CI, internal scripts, debugging tools, etc.
• dunno — I don't know

Test Plan

1. Add a step-by-step description of how to test your PR here.

• Unit Tests
• End to end tests

Release Notes

• Add a brief release note for your PR here.

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Name	Status	Preview	Updated (UTC)
examples	✅ Ready (Inspect)	Visit Preview	Mar 28, 2024 2:17pm

1 Ignored Deployment

Name	Status	Preview	Updated (UTC)
tldraw-docs	⬜️ Ignored (Inspect)	Visit Preview	Mar 28, 2024 2:17pm

[TodePond]

will be continued in #3297