Add support for char and char_wb analyzers in TfidfVectorizer/CountVe… #1211
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Add support for char and char_wb analyzers in TfidfVectorizer/CountVectorizer
Currently skl2onnx only supports analyzer="word" for CountVectorizer and
TfidfVectorizer. Using "char" or "char_wb" raises NotImplementedError.
This PR extends the converter to handle character-based analyzers by
emitting ONNX Tokenizer + Ngram operators configured for character-level
ngrams. For "char_wb" mode, a regex approximation is used to simulate
boundary-aware ngrams.