UI: add Checkbox primitive

[Sukhendu2002]

What?

Part of: #74178

Add Checkbox primitive component to @wordpress/ui.

Testing Instructions

See stories in Storybook.

Screenshots or screencast

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[ciampo]

@Sukhendu2002 thank you for working on this! However, the new form primitive components in @wordpress/ui will mostly be added by @mirka, who has already been preparing them.

You will note, in fact, that #74178 is assigned to @mirka . In the future, I recommend coordinating on the original issue before opening a PR.

I'm going to close this PR for now — @mirka feel free to re-open it and iterate in case that's your preference