MSQ worker: Support in-memory shuffles. #11201

Job	Run time
build (jdk8)	12m 22s
build (jdk11)	14m 28s
build (jdk17)	13m 10s
build (jdk21)	12m 13s
unit tests (jdk8, sql-compat=false) / changes	7s
unit tests (jdk8, sql-compat=true) / changes	2s
unit tests (jdk8, sql-compat=true) / other_modules_test / other modules test	5h 38m 10s
unit tests (jdk8, sql-compat=false) / other_modules_test / other modules test	5h 38m 8s
unit tests (jdk8, sql-compat=true) / server_modules_test / server modules test	7m 57s
unit tests (jdk8, sql-compat=true) / processing_modules_test / processing modules test	50m 45s
unit tests (jdk8, sql-compat=true) / indexing_modules_test / indexing modules test	50m 44s
unit tests (jdk8, sql-compat=false) / indexing_modules_test / indexing modules test	47m 47s
unit tests (jdk8, sql-compat=false) / processing_modules_test / processing modules test	54m 47s
unit tests (jdk8, sql-compat=false) / server_modules_test / server modules test	7m 52s
revised-its	1s
standard-its	1s
unit tests (jdk${{ matrix.jdk }}, sql-compat=true)	1s
	15h 48m 35s

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