feat: support multi-character suggestions

[nperez0111]

This introduces the ability to have multiple character suggestions (so that a suggestion may be triggered with JIRA# for example)

[vercel]

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Name	Status	Preview	Updated (UTC)
blocknote	✅ Ready (Inspect)	Visit Preview	Jun 3, 2025 9:06am
blocknote-website	✅ Ready (Inspect)	Visit Preview	Jun 3, 2025 9:06am

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@blocknote/ariakit

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@blocknote/code-block

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@blocknote/core

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@blocknote/mantine

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@blocknote/react

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@blocknote/server-util

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@blocknote/shadcn

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@blocknote/xl-ai

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@blocknote/xl-docx-exporter

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@blocknote/xl-multi-column

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@blocknote/xl-odt-exporter

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@blocknote/xl-pdf-exporter

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commit: 657049a