Add hf tokenizer class definition header #57
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Issue:
The current implementation of the HFTokenizer has specialized methods that expose the add_special_tokens flag. However these are inside the .cc file and are not exposed as part of the api/cmake includes
Fix:
This splits the definition and instantiation of the HFTokenizer, allowing me to place the definition in the header file (I placed in tokenizers_cpp.h )
I also added/moved the factory methods for constructing the derived HFTokenizer class into HFTokenizer, and then had the base classes factory call those (allowing for implicit conversion of the unique pointer from HFTokenizer to Tokenizer.)