perf: implement conv1d with im2col and GEMM (#1597) #2645

Job	Run time
build-and-push-docker-images	23m 6s
build-python-wheels (ubuntu-20.04, auto64)	26m 4s
build-python-wheels (macos-11, auto64)	34m 30s
build-python-wheels (windows-2019, auto64)	46m 24s
build-and-test-cpp-x86_64 (ubuntu-20.04, mkl)	5m 23s
build-python-wheels (ubuntu-20.04, aarch64)	1h 14m 9s
build-and-test-cpp-aarch64 (openblas)	3m 56s
check-python-style	8s
build-and-test-cpp-x86_64 (ubuntu-20.04, dnnl)	5m 20s
build-python-wheels (macos-11, arm64)	10m 55s
build-and-test-cpp-x86_64 (macos-11, mkl)	10m 16s
build-and-test-cpp-x86_64 (macos-11, dnnl)	10m 34s
build-and-deploy-docs	51s
test-python-wheels (ubuntu-20.04)	9m 21s
test-python-wheels (macos-11)	3m 50s
test-python-wheels (windows-2019)	4m 35s
publish-python-wheels-on-pypi	0s
	4h 29m 22s

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