ensemble rowwise adagrad (fbgemm frontend) #8068

Job	Run time
build-bazel (x86, linux.12xlarge, gcc)	8m 32s
build-bazel (x86, linux.12xlarge, clang)	7m 41s
build-linux (x86, linux.12xlarge, static, gcc)	17m 19s
build-macos (macos-13, static)	15m 25s
build-linux (x86, linux.12xlarge, static, clang)	15m 2s
build-macos (macos-13, shared)	10m 18s
build-linux (x86, linux.12xlarge, shared, gcc)	17m 10s
build-linux (x86, linux.12xlarge, shared, clang)	15m 7s
build-windows (windows-2022, static)	12m 18s
build-windows (windows-2022, shared)	12m 25s
	2h 11m 17s

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