Replaced gavgpool and gsumpool with static_reduce. #3147

Job	Run time
build-and-test / cmake-linux-armhf	6m 43s
build-and-test / cmake-linux-riscv64-rvv	12m 39s
build-and-test / cmake-linux-riscv64	8m 16s
build-and-test / cmake-linux-aarch64	6m 22s
build-and-test / cmake-linux-x86_64	7m 27s
build-and-test / cmake-ios-arm64	4m 38s
build-and-test / bazel-linux-x86_64-clang-18	7m 21s
build-and-test / bazel-linux-x86_64-gcc-9	5m 26s
build-and-test / cmake-android (arm64)	6m 59s
build-and-test / cmake-android (armv7)	6m 7s
build-and-test / cmake-ios-x86_64	6m 48s
build-and-test / cmake-macos-arm64	5m 24s
build-and-test / cmake-windows-arm64	4m 41s
build-and-test / cmake-android (x86)	7m 47s
build-and-test / cmake-windows-x86	6m 31s
build-and-test / cmake-windows-x64	4m 41s
build-and-test / bazel-linux-aarch64	5m 23s
	1h 53m 13s

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