feat: Pasting & dropping files

[dcadavez66]

Added support to paste images from the clipboard into the editor

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Name	Status	Preview	Updated (UTC)
blocknote	✅ Ready (Inspect)	Visit Preview	Jun 24, 2024 7:11pm
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[matthewlipski]

Awesome, thanks for this! I also extended your code to work with all file block types in the editor based on the pasted file's MIME type, and added the same functionality for dragging and dropping files:)

Besides refactoring, I made one fairly major change in that the files pasted/dropped are uploaded using editor.uploadFile instead of converting them to a URL using the helper function you created. This is just a bit more in line architecturally with how we want file blocks to work, but also means that a backend has to be provided for file pasting/dropping to work. That being said, it's a more robust solution overall and I expect that the vast majority of people using BlockNote will already have some kind of backend for this.

Closes #715
Closes #693

[YousefED]

nice! small comments