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feat: object shorthand optional properties (#1938)

* feat: object shorthand optional properties

`{ y? }` now compiles to `{ ...((y != null) && {y}) }` instead of
`{ y: (y != null) }`, making it mean "maybe put y in the object".

Also adds value form: `{ y?: value }` compiles to
`{ ...(value != null ? {y: value} : {}) }`, with ref support for
complex expressions.

Closes #1883

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Co-authored-by: claude[bot] <41898282+claude[bot]@users.noreply.github.com>
Co-authored-by: Daniel X Moore <STRd6@users.noreply.github.com>
Co-authored-by: Erik Demaine <edemaine@mit.edu>

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