Migrate GenAI kv cache kernels to `FBGEMM_LAUNCH_KERNEL`, pt 1 #18667

Job	Run time
build-bazel (x86, linux.12xlarge, clang)	9m 25s
build-windows (windows-2022, static)	12m 16s
build-macos (macos-13, static)	23m 59s
build-macos (macos-13, shared)	28m 52s
build-bazel (x86, linux.12xlarge, gcc)	10m 9s
build-windows (windows-2022, shared)	13m 35s
build-linux (x86, linux.12xlarge, shared, gcc, 9.5.0)	25m 48s
build-linux (x86, linux.12xlarge, static, gcc, 9.5.0)	25m 57s
build-linux (arm, linux.arm64.m7g.4xlarge, shared, gcc, 14.1.0)	1h 23m 34s
build-linux (x86, linux.12xlarge, static, gcc, 14.1.0)	26m 24s
build-linux (x86, linux.12xlarge, shared, clang, 16.0.6)	19m 55s
build-linux (x86, linux.12xlarge, shared, gcc, 14.1.0)	26m 27s
build-linux (arm, linux.arm64.m7g.4xlarge, static, gcc, 14.1.0)	1h 21m 53s
build-linux (arm, linux.arm64.m7g.4xlarge, static, clang, 16.0.6)	32m 57s
build-linux (arm, linux.arm64.m7g.4xlarge, shared, clang, 16.0.6)	33m 5s
build-linux (x86, linux.12xlarge, static, clang, 16.0.6)	20m 5s
	7h 54m 21s

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