[Example] NanoGPT support in DLrover #1534

Job	Run time
atorch-pre-commit	4m 12s
dlrover-client-test	2m 53s
brain-test	3m 15s
atorch-python-test	5m 34s
dlrover-python-test	3m 16s
dlrover-system-test-criteo-deeprec	3m 46s
dlrover-system-test-deepfm	3m 27s
dlrover-trainer-test	2m 15s
dlrover-system-test-tf2	1m 56s
operator-test	3m 7s
pre-commit	1m 51s
tfplus-pre-commit	1m 12s
tfplus-python-test	1m 3s
	37m 47s

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