Added support for RobertaModel to transformers.py #3019

Job	Run time
build-and-test-cpp-x86_64 (ubuntu-20.04, mkl)	11m 15s
build-and-test-cpp-aarch64 (openblas)	4m 21s
build-and-test-cpp-x86_64 (ubuntu-20.04, dnnl)	8m 10s
build-python-wheels (ubuntu-20.04, auto64)	1m 22s
build-and-push-docker-images	32m 44s
check-python-style	17s
build-python-wheels (windows-2019, auto64)	1m 6s
build-python-wheels (ubuntu-20.04, aarch64)	1m 23s
build-python-wheels (macos-13, arm64)	1m 33s
test-python-wheels	0s
build-and-deploy-docs	0s
publish-python-wheels-on-pypi	0s
	1h 2m 11s

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