Bump max shapes to 4000

[steveruizok]

This PR increases the maximum number of shapes per page from 2000 to 4000.

Change Type

• [x] sdk — Changes the tldraw SDK
• [x] improvement — Improving existing features

Test Plan

1. Create max shapes
2. Does it work?

• [ ] Unit Tests
• [ ] End to end tests

Release Notes

• Increase maximum number of shapes per page from 2000 to 4000.

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Name	Status	Preview	Updated (UTC)
examples	✅ Ready (Inspect)	Visit Preview	May 8, 2024 7:30am

1 Ignored Deployment

| Name | Status | Preview | Updated (UTC) | | :--- | :----- | :------ | :------ | | **tldraw-docs** | ⬜️ Ignored ([Inspect](https://vercel.com/tldraw/tldraw-docs/45KJC87hsd9hc5foojvWpwqgD8eq)) | | May 8, 2024 7:30am |

[MitjaBezensek]

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