fix: match query anywhere to filter slash menu items

[shahvicky]

Notion menu item filtering

Current BlockNote filtering only matches start of the word. This PR fixes it to match query anywhere in the item or alias text

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Name	Status	Preview	Updated (UTC)
blocknote	✅ Ready (Inspect)	Visit Preview	May 2, 2024 8:37pm

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[YousefED]

thanks!