Make Dask an optional dependency

[thehomebrewnerd]

Make Dask an optional dependency

Closes #1423

[codecov]

Codecov Report

Merging #2560 (b5aced3) into main (1e40a89) will decrease coverage by 0.01%.
The diff coverage is 99.23%.

❗ Current head b5aced3 differs from pull request most recent head 91974be. Consider uploading reports for the commit 91974be to get more accurate results

@@            Coverage Diff             @@
##             main    #2560      +/-   ##
==========================================
- Coverage   99.46%   99.46%   -0.01%     
==========================================
  Files         392      392              
  Lines       23153    23211      +58     
==========================================
+ Hits        23030    23087      +57     
- Misses        123      124       +1     

Impacted Files	Coverage Δ
featuretools/tests/utils_tests/test_utils_info.py	100.00% <ø> (ø)
featuretools/computational_backends/utils.py	95.28% <88.88%> (-0.37%)	⬇️
...computational_backends/calculate_feature_matrix.py	100.00% <100.00%> (ø)
...s/computational_backends/feature_set_calculator.py	98.71% <100.00%> (ø)
featuretools/entityset/deserialize.py	100.00% <100.00%> (ø)
featuretools/entityset/entityset.py	99.22% <100.00%> (ø)
featuretools/feature_base/feature_base.py	98.15% <100.00%> (ø)
...s/primitives/standard/aggregation/all_primitive.py	100.00% <100.00%> (ø)
...s/primitives/standard/aggregation/any_primitive.py	100.00% <100.00%> (ø)
...etools/primitives/standard/aggregation/num_true.py	96.15% <100.00%> (ø)
... and 18 more

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[dvreed77]

lgtm, but would feel better with another approval

[sbadithe]

Would it be a good idea to have a Dask not installed error message saved instead of copying it for all Dask tests?

[thehomebrewnerd]

We could do that, but the only people that ever see this message are developers, so I don't think it's critical that this message be the same everywhere.

[sbadithe]

Makes sense. I was wondering more from a code cleanliness perspective.