Added converter for MixFormerSequentialForCausalLM #2455

Job	Run time
build-and-push-docker-images	39m 13s
build-python-wheels (ubuntu-20.04, auto64)	40m 18s
build-and-test-cpp-x86_64 (ubuntu-20.04, mkl)	7m 14s
build-and-test-cpp-aarch64 (openblas)	7m 0s
build-python-wheels (macos-11, auto64)	57m 55s
build-and-test-cpp-x86_64 (ubuntu-20.04, dnnl)	6m 14s
check-python-style	11s
build-python-wheels (windows-2019, auto64)	1h 5m 4s
build-and-test-cpp-x86_64 (macos-11, mkl)	12m 10s
build-python-wheels (ubuntu-20.04, aarch64)	1h 29m 4s
build-and-test-cpp-x86_64 (macos-11, dnnl)	12m 33s
build-python-wheels (macos-11, arm64)	17m 15s
build-and-deploy-docs	55s
test-python-wheels (ubuntu-20.04)	15m 22s
test-python-wheels (macos-11)	6m 4s
test-python-wheels (windows-2019)	3m 47s
publish-python-wheels-on-pypi	0s
	6h 20m 19s

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