Add cmake command-line setting for spdlog logging level

[jlowe]

This adds the ability to configure the spdlog logging level on the cmake command-line, defaulting to no logging.

[GPUtester]

Please update the changelog in order to start CI tests.

View the gpuCI docs here.

[kkraus14]

LGTM, @harrism would be good for you to review as well

[codecov]

Codecov Report

Merging #6215 into branch-0.16 will increase coverage by 0.32%.
The diff coverage is n/a.

@@               Coverage Diff               @@
##           branch-0.16    #6215      +/-   ##
===============================================
+ Coverage        84.30%   84.63%   +0.32%     
===============================================
  Files               82       82              
  Lines            13745    14087     +342     
===============================================
+ Hits             11588    11922     +334     
- Misses            2157     2165       +8     

Impacted Files	Coverage Δ
python/cudf/cudf/io/feather.py	100.00% <0.00%> (ø)
python/cudf/cudf/comm/serialize.py	0.00% <0.00%> (ø)
python/custreamz/custreamz/_version.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)
...ython/custreamz/custreamz/tests/test_dataframes.py	100.00% <0.00%> (ø)
...ython/dask_cudf/dask_cudf/io/tests/test_parquet.py	100.00% <0.00%> (ø)
python/cudf/cudf/utils/applyutils.py	98.75% <0.00%> (+0.02%)	⬆️
... and 31 more

---

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[jlowe]

The unit test failures are:

FAILED cudf/tests/test_csv.py::test_csv_writer_file_handle - NotImplementedError: Unsupported encoding ISO-8859-1
FAILED cudf/tests/test_csv.py::test_csv_writer_file_append - NotImplementedError: Unsupported encoding ISO-8859-1

which I believe is a known issue happening on some of the CI build machines. It does not seem related to this change.

[harrism]

Looks good, just wondering if this can be inherited from the RMM cmake...

[harrism]

Is there a way we can just inherit this from the RMM cmake?

[jlowe]

cudf is currently picking up RMM via a conda package which does not ship any cmake files, so I don't know of a way to do this as RMM is located by libcudf today.

I think we'd either have to add a cmake snippet to the librmm conda package and have libcudf pick up the cmake settings from there, or we'd need to have libcudf pull RMM's source as it does Thrust/CUB today. However I don't know if avoiding the RMM conda package and pulling RMM source is something we want to do. @kkraus14

I suspect the RMM cmake source may also need to be refactored to make picking this up from other projects easier to do.

[kkraus14]

Eventually the plan will be to export the cmake info in the librmm conda package so someone can do find_package(rmm) and get a nice target that allows inheriting options like these. We're still likely a bit away from that though.

[jlowe]

@harrism thanks for the second round of review. I updated the default RMM logging level to INFO.