Added converter for MixFormerSequentialForCausalLM #2453

Job	Run time
check-python-style	10s
build-and-test-cpp-x86_64 (ubuntu-20.04, mkl)	6m 57s
build-and-test-cpp-aarch64 (openblas)	7m 55s
build-and-test-cpp-x86_64 (ubuntu-20.04, dnnl)	6m 22s
build-and-push-docker-images	47m 51s
build-and-test-cpp-x86_64 (macos-11, mkl)	10m 47s
build-python-wheels (ubuntu-20.04, auto64)	39m 54s
build-python-wheels (macos-11, auto64)	43m 16s
build-and-test-cpp-x86_64 (macos-11, dnnl)	9m 44s
build-python-wheels (windows-2019, auto64)	1h 11m 44s
build-python-wheels (ubuntu-20.04, aarch64)	1h 32m 55s
build-python-wheels (macos-11, arm64)	14m 36s
build-and-deploy-docs	55s
test-python-wheels (ubuntu-20.04)	10m 23s
test-python-wheels (macos-11)	6m 24s
test-python-wheels (windows-2019)	3m 43s
publish-python-wheels-on-pypi	0s
	6h 13m 36s

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