Add support for Uppy for file uploading

[YousefED]

Is your feature request related to a problem? Please describe.
We'd like to add support for https://uppy.io/ for file uploading. This would require:

Describe the solution you'd like
Initially, creating an example (similar to other blocknote examples in the example directory would suffice (as part of follow up work, later we could see what we can extract to a reusable package).

The main requirements are:

• Most important: customize the BlockNote FilePanel to use the Uppy React library (use a FilePanelController and the Uppy Dashboard for this)
• Make sure the uploadFile function also uses the uppy pipeline
• It should be clear in the code where you can configure additional Uppy options such as a companion URL or transloadit server

Of course, it must work for selecting / uploading resources for different blocks (e.g.: File / Image / Video)

[YousefED]

/bounty 100

[algora-pbc]

💎 $100 bounty • BlockNote

Steps to solve:

1. Start working: Comment /attempt #807 with your implementation plan
2. Submit work: Create a pull request including /claim #807 in the PR body to claim the bounty
3. Receive payment: 100% of the bounty is received 2-5 days post-reward. Make sure you are eligible for payouts

Thank you for contributing to TypeCellOS/BlockNote!

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Attempt	Started (GMT+0)	Solution
🟢 @ezhil56x	Jun 5, 2024, 9:08:44 AM	#842
🔴 @rajeshj11	Jun 13, 2024, 3:20:51 PM	WIP

[ezhil56x]

Can I get assigned?
/attempt #807

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[ezhil56x]

@YousefED
It would be great if it is assigned, as it's a feature to be implemented.
Thanks!

[algora-pbc]

💡 @ezhil56x submitted a pull request that claims the bounty. You can visit your bounty board to reward.

[rajeshj11]

/attempt #807

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