Migrate GenAI kv cache kernels to `FBGEMM_LAUNCH_KERNEL`, pt 1 #18660

Job	Run time
build-bazel (x86, linux.12xlarge, clang)	9m 27s
build-bazel (x86, linux.12xlarge, gcc)	10m 9s
build-macos (macos-13, static)	13m 9s
build-windows (windows-2022, static)	12m 10s
build-macos (macos-13, shared)	18m 54s
build-linux (x86, linux.12xlarge, static, clang, 16.0.6)	20m 14s
build-linux (x86, linux.12xlarge, static, gcc, 14.1.0)	26m 29s
build-linux (x86, linux.12xlarge, static, gcc, 9.5.0)	25m 51s
build-linux (x86, linux.12xlarge, shared, gcc, 9.5.0)	25m 40s
build-windows (windows-2022, shared)	13m 25s
build-linux (arm, linux.arm64.m7g.4xlarge, static, gcc, 14.1.0)	1h 19m 18s
build-linux (arm, linux.arm64.m7g.4xlarge, shared, gcc, 14.1.0)	1h 24m 28s
build-linux (arm, linux.arm64.m7g.4xlarge, static, clang, 16.0.6)	33m 2s
build-linux (x86, linux.12xlarge, shared, clang, 16.0.6)	19m 51s
build-linux (arm, linux.arm64.m7g.4xlarge, shared, clang, 16.0.6)	33m 7s
build-linux (x86, linux.12xlarge, shared, gcc, 14.1.0)	26m 35s
	7h 31m 49s

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