unstructured

b2b92ea7 - fix: filetype detection if a CSV has a text/plain MIME type (#691)

fix: filetype detection if a CSV has a text/plain MIME type (#691) * fix: Filetype detection if a CSV has a text/plain MIME type #621 * bug: fix csv detection and create _read_file_start_for_type_check func * fix: Make call to _is_text_file_a_csv from detect_filetype