Fix default parameter values of write_csv and write_parquet

[vuule]

Fixes #6671, #6851

• Set the rows_per_chunk in csv_writer_options to the size of the input table.
• Change rows_per_chunk type to size_type (used for number of rows).
• Set the default compression in to_parquet/write_parquet to "snappy".

[vuule]

rerun tests

[kkraus14]

python lgtm

[codereport]

lgtm

[codecov]

Codecov Report

Merging #6967 (f54f10d) into branch-0.18 (8a1a6d7) will increase coverage by 1.33%.
The diff coverage is n/a.

@@               Coverage Diff               @@
##           branch-0.18    #6967      +/-   ##
===============================================
+ Coverage        81.59%   82.93%   +1.33%     
===============================================
  Files               96       96              
  Lines            15907    17388    +1481     
===============================================
+ Hits             12980    14420    +1440     
- Misses            2927     2968      +41     

Impacted Files	Coverage Δ
python/cudf/cudf/utils/ioutils.py	78.71% <ø> (ø)
python/dask_cudf/dask_cudf/io/parquet.py	91.07% <ø> (+0.24%)	⬆️
python/cudf/cudf/io/csv.py	93.75% <0.00%> (-0.25%)	⬇️
python/cudf/cudf/io/feather.py	100.00% <0.00%> (ø)
python/cudf/cudf/comm/serialize.py	0.00% <0.00%> (ø)
python/cudf/cudf/_fuzz_testing/io.py	0.00% <0.00%> (ø)
python/dask_cudf/dask_cudf/_version.py	0.00% <0.00%> (ø)
python/dask_cudf/dask_cudf/io/tests/test_csv.py	100.00% <0.00%> (ø)
python/dask_cudf/dask_cudf/io/tests/test_orc.py	100.00% <0.00%> (ø)
python/dask_cudf/dask_cudf/io/tests/test_json.py	100.00% <0.00%> (ø)
... and 38 more

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[vuule]

Rerun tests