feat(divider): add a divider block

[nperez0111]

This adds a new block Divider which is a horizontal rule.

Fixes #1488

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Project	Deployment	Preview	Updated (UTC)
blocknote	Error		Sep 18, 2025 2:36pm
blocknote-website	Ready	Preview	Sep 18, 2025 2:36pm

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commit: 9b9b159

[matthewlipski]

Minor thing - we should add the divider to the basic/all-blocks example and unit/e2e test cases with all default blocks