Add features from Llama Nemotron tutorial to NeMo Curator modules

[sarahyurick]

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While some of the classes in https://github.com/NVIDIA/NeMo-Curator/pull/695 are very specific to the dataset being curated, others could be useful for a variety of datasets and should be added as NeMo Curator modules.

In particular, I think it would be nice to add these as modules: NonEnglishFilter (could be generalized to any language), TokenCountFilter, and CompletionTokenCountFilter.