Add SPI for delegating row expression optimizer #284

Job	Run time
prestocpp-macos-build-engine	2h 1m 19s
prestocpp-macos-build-engine	1h 51m 37s
prestocpp-macos-build-engine	1h 39m 33s
prestocpp-macos-build-engine	2h 29m 1s
	8h 1m 30s

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