Add _PATHS to text classification datasets, add global MD5 and NUM_LINES #1155
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Currently text classification datasets will download from google drive even if the result already exists on disk, because google drive URLs do not allow to infer the path at which the download result will be stored. This PR addresses this for translation datasets and further introduces torchtext.experimental.datasets.raw.MD5 and NUM_LINES dictionaries to allow for easier access of this meta information. It also fixes meta information for the wrapped dataset factory function to actually contain the defaults for split, root and offset.