[mlir][Sol] Support packed and unpacked string storage layouts #51

Job	Run time
target-machine	4s
prepare-test-matrix	1m 0s
regression-tests (60bc3d5b69bfa314a6ed42d90a676be46b5029f6, default)	15m 53s
check-formatting (60bc3d5b69bfa314a6ed42d90a676be46b5029f6)	7m 31s
	24m 28s

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