Deletes the Parquet files that chiload(full = TRUE)
wrote to the cache directory (tempdir() by default, or the
directory named in options(rmoriedata.cache_dir = )): the
arrests_full.parquet and complaints_full.parquet files,
their .sha256 checksum files and any unfinished write
(write-*.parquet and its .sha256). Nothing else in that
directory is touched.