Add asset pruning when importing files

[MitjaBezensek]

Adds pruning of unused assets when importing files.

Pulled out the pruning logic from the exporting of tldraw files and we now use the same logic for both cases.

Change Type

• [x] 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
• [x] 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

Release Notes

• Prunes unused assets when loading a tldraw document.

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Name	Status	Preview	Updated (UTC)
examples	✅ Ready (Inspect)	Visit Preview	May 3, 2024 11:03am

1 Ignored Deployment

| Name | Status | Preview | Updated (UTC) | | :--- | :----- | :------ | :------ | | **tldraw-docs** | ⬜️ Ignored ([Inspect](https://vercel.com/tldraw/tldraw-docs/F8zQ5DGCg7LubiC3YK1FQT2nomMQ)) | [Visit Preview](https://tldraw-docs-git-mitja-prune-assets-tldraw.vercel.app) | May 3, 2024 11:03am |