[Example] NanoGPT support in DLrover #1549

Job	Run time
atorch-python-test	5m 23s
dlrover-client-test	2m 47s
atorch-pre-commit	4m 13s
brain-test	3m 24s
dlrover-python-test	3m 40s
dlrover-system-test-criteo-deeprec	3m 14s
dlrover-system-test-deepfm	3m 23s
dlrover-system-test-tf2	2m 27s
dlrover-trainer-test	2m 14s
operator-test	2m 40s
pre-commit	13m 19s
tfplus-pre-commit	58s
tfplus-python-test	1m 9s
	48m 51s

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