Remove dependency on convert_str_id_to_int in FuzzyDedup Scripts

[praateekmahajan]

Is your feature request related to a problem? Please describe.
During the minhash script we implicitly convert str id to 2 int ids (doc_id + dataset_id). This is different from the FuzzyDuplicate(...) api where no such conversion is performed. In an ideal world, we don't rely on conversion of a string to int ids.

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