Add submodule redis #25

Job	Run time
cmake-install-windows (windows-2019)	10m 55s
b2-posix (ubuntu-20.04)	14m 53s
cmake-install-windows (windows-2022)	13m 11s
b2-windows (windows-2019)	34m 5s
cmake-install-posix (ubuntu-20.04)	5m 36s
b2-posix (ubuntu-22.04)	14m 6s
b2-windows (windows-2022)	50m 47s
cmake-install-posix (ubuntu-22.04)	6m 2s
b2-posix (macos-11)	22m 40s
cmake-install-posix (macos-11)	11m 27s
b2-posix (macos-12)	24m 38s
cmake-test-posix (ubuntu-20.04)	29m 20s
cmake-install-posix (macos-12)	9m 52s
cmake-test-windows (windows-2019)	25m 50s
b2-posix (macos-13)	19m 21s
cmake-test-posix (ubuntu-22.04)	30m 55s
cmake-test-windows (windows-2022)	27m 52s
cmake-test-posix (macos-11)	35m 58s
cmake-install-posix (macos-13)	8m 33s
cmake-test-posix (macos-12)	37m 44s
cmake-test-posix (macos-13)	31m 47s
	7h 45m 32s

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