static IdlTokenizer create(String filename, CharSequence model) {
        return new DefaultTokenizer(filename, model);
    }
Create a tokenizer for the given filename and model.

@param filename Filename being parsed.
@param model    IDL model contents to parse.
@return         Returns the tokenizer.
smithy-model/src/main/java/software/amazon/smithy/model/loader/IdlTokenizer.java