Data Health: Sparsity

[chukarsten]

Implements #1797

[codecov]

Codecov Report

Merging #1797 (d271642) into main (4159d08) will increase coverage by 0.1%.
The diff coverage is 100.0%.

@@            Coverage Diff            @@
##             main    #1797     +/-   ##
=========================================
+ Coverage   100.0%   100.0%   +0.1%     
=========================================
  Files         248      250      +2     
  Lines       19896    19972     +76     
=========================================
+ Hits        19888    19964     +76     
  Misses          8        8             

Impacted Files	Coverage Δ
evalml/data_checks/__init__.py	100.0% <100.0%> (ø)
evalml/data_checks/data_check_message_code.py	100.0% <100.0%> (ø)
evalml/data_checks/sparsity_data_check.py	100.0% <100.0%> (ø)
...ests/data_checks_tests/test_sparsity_data_check.py	100.0% <100.0%> (ø)

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[angela97lin]

Loooooks great! Added a few comments mostly for cleanup but otherwise, 🚢 !!

[bchen1116]

LGTM! Left a few comments on things to fix