Add RedPajama-V2 dataset to TFDS. #9617

Job	Run time
Check whether we should run tests or not	9s
Github API tests	3m 15s
Notebook tests	7m 10s
HuggingFace Python 3.10 tests	3m 12s
Core TFDS tests / Generate shards	1s
Core TFDS tests / [Python 3.10][1/4]	6m 4s
Core TFDS tests / [Python 3.11][1/4]	5m 28s
Core TFDS tests / [Python 3.12][1/4]	6m 17s
Core TFDS tests / [Python 3.10][2/4]	5m 22s
Core TFDS tests / [Python 3.11][2/4]	5m 0s
Core TFDS tests / [Python 3.12][2/4]	6m 4s
Core TFDS tests / [Python 3.10][3/4]	5m 42s
Core TFDS tests / [Python 3.11][3/4]	5m 26s
Core TFDS tests / [Python 3.12][3/4]	6m 37s
Core TFDS tests / [Python 3.10][4/4]	5m 48s
Core TFDS tests / [Python 3.11][4/4]	5m 17s
Core TFDS tests / [Python 3.12][4/4]	6m 12s
	1h 23m 4s

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