Gives ability to add props on block Video

[AntoLC]

Is your feature request related to a problem? Please describe.
We have pages with lot of videos and some of them can be huge.
We don't want that they download automatically in background.
To do so, it could be nice to have the ability to add preload="none" on the video tag.

The problem is to override the block Video seems quite complicated from packages/core/src/blocks/Video/block.ts.

But we could use directly and createVideoBlockSpec, it could be nice to be able to add some property to it, to have the ability to add props on the video tag, example:

...
video: createVideoBlockSpec({
   preload: 'none', // ("none" | "metadata" | "auto")
}),

Then here:

BlockNote/packages/core/src/blocks/Video/block.ts

Lines 92 to 95 in 9e5ffa8

	video.controls = true;
	video.contentEditable = "false";
	video.draggable = false;
	video.width = block.props.previewWidth;

It would be:

      video.preload = config.preload;

Thank you !

Bonus

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