fix: allow container ref with null and undefined for useResize

[floriangosse]

Why

Allow to pass nullish container references to useResize.

What

Extended type of useResize to allow null and undefined as reference value types as well.

Checklist

• Documentation updated
• Demo added
• Ready to be merged

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Latest commit: 54dc175

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Name	Status	Preview	Comments	Updated
react-spring	✅ Ready (Inspect)	Visit Preview	💬 Add your feedback	Feb 13, 2023 at 7:22PM (UTC)

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[joshuaellis]

Nice addition! Thank you 🙇🏼‍♀️