[field] New `Field.Item` part

[mj12albert]

💥 Breaking: When integrating Field with CheckboxGroup or RadioGroup, Field.Item must be wrapped around each individual radio/checkbox in the group

Preview: https://deploy-preview-2183--base-ui.netlify.app/experiments/form

Closes https://github.com/mui/base-ui/issues/2172

• [x] I have followed (at least) the PR section of the contributing guide.

[mui-bot]

Bundle size report

Bundle	Parsed Size	Gzip Size
@base-ui-components/react	🔺+1.24KB(+0.41%)	🔺+502B(+0.52%)

Details of bundle changes

Generated by :no_entry_sign: dangerJS against c199562d2bcdcbb799991d8380416bd32ee36454

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pnpm add https://pkg.pr.new/mui/base-ui/@base-ui-components/react@2183

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commit: 2bd52b4

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Bundle size report

Bundle	Parsed size	Gzip size
@base-ui-components/react	🔺+1.31KB(+0.38%)	🔺+510B(+0.46%)

Details of bundle changes

[mj12albert]

https://github.com/mui/base-ui/pull/2810