Add ability to provide callback to describe

[ParthivNaresh]

Fixes: #940

[codecov]

Codecov Report

Merging #1387 (bc52017) into main (3ab4225) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #1387   +/-   ##
=======================================
  Coverage   99.96%   99.96%           
=======================================
  Files          97       97           
  Lines       10389    10420   +31     
=======================================
+ Hits        10385    10416   +31     
  Misses          4        4           

Impacted Files	Coverage Δ
woodwork/statistics_utils/_get_describe_dict.py	100.00% <100.00%> (ø)
woodwork/table_accessor.py	100.00% <100.00%> (ø)
woodwork/tests/accessor/test_statistics.py	99.49% <100.00%> (+0.01%)	⬆️
woodwork/tests/conftest.py	100.00% <100.00%> (ø)

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[bchen1116]

Looks good to me! Left one rec on buffing up the test, but not blocking!