Introduce user defined SQL planner API (#11180)

* Prototype user defined sql planner might look like

* at arrow

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* get field

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* cleanup

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* plan array literal

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* move to functions-array

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* license

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* cleanup

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* fix

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* change nested array test

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* address comment

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* fix stack overflow issue

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* upd cli

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* fix doc

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* fix doc

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* Rename PlannerResult::Simplified to PlannerResult::Planned

* Update comments and add Debug/Clone impls

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Signed-off-by: jayzhan211 <[email protected]>
Co-authored-by: Andrew Lamb <[email protected]>