feat(react/utils): Add useProxy() hook

[sarimarton]

Related Issues

Follow-up on https://github.com/pmndrs/valtio/discussions/620

Summary

• [x] Adds useProxy() hook.
• [x] Deprecates valtio/macro and valtio/vacro/vite.
• [ ] Update readme

Check List

• [ ] yarn run prettier for formatting code and docs

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Name	Status	Preview	Updated
valtio	✅ Ready (Inspect)	Visit Preview	Jan 15, 2023 at 4:20AM (UTC)

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React Browserify	Configuration
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[dai-shi]

https://codesandbox.io/s/react-typescript-forked-ix38xu

Deprecation message works.

[dai-shi]

Hmm, I want to reorganize entry points. Will do it in a new PR along with updating readme.