Issue #230: Add HuggingFace vocab format to Bert tokenizer
Issue #230: Add HuggingFace vocab format to Bert tokenizer

HuggingFace vocab format is newline separated (unlike GPT which is
json). Newline separated is likely to be faster and doesn't require
an external library to parse it. Instead of introducing a json based
format, added support for native HuggingFace newline separated token
format.

microsoft/onnxruntime-extensions,microsoft/onnxruntime-extensions,microsoft/onnxruntime-extensions,microsoft/onnxruntime-extensions,microsoft/onnxruntime-extensions