What does this PR do ?

Add a null tokenizer to ease the runs for performance benchmark and debugging

Changelog

Add a null tokenizer

Usage

tokenizer=run.Config(                                  
    get_nmt_tokenizer,                                  
    library="null",                                   
    model_name = "NullTokenizer",                            
    vocab_size = 256000,
)

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Additional Information

• Related to # (issue)