Updated partition and partition_xlsx for latest unstructured

bumped unstructured dependency and updated HISTORY

moved unstructured contrib into code base and added dependency, updat…

…ed README on how to use

added html conversion functions and an html data interface

updated get_df_from_file to accept filename or io object

added support for python 3.8 and 3.11

added unstructured-like xlsx partition handler to contrib

added get_df_from_file helper function and refactored cli

optimized database inserts for speed

fixed setup bug