Add top-level search method

[dsherry]

First draft of a top-level search method. This method is our recommendation for how to use woodwork, data checks and automl search together. It defines an interface which sets up the woodwork schema (if the input didn't already set woodwork types), runs our default data checks and then if there are no errors runs automl search.

Once data check actions have been added, we can add support for that here as well.

[codecov]

Codecov Report

Merging #2152 (5abe600) into main (838da3c) will increase coverage by 0.1%.
The diff coverage is 100.0%.

@@            Coverage Diff            @@
##             main    #2152     +/-   ##
=========================================
+ Coverage   100.0%   100.0%   +0.1%     
=========================================
  Files         287      288      +1     
  Lines       24399    24449     +50     
=========================================
+ Hits        24381    24431     +50     
  Misses         18       18             

Impacted Files	Coverage Δ
evalml/__init__.py	100.0% <100.0%> (ø)
evalml/automl/__init__.py	100.0% <100.0%> (ø)
evalml/automl/automl_search.py	100.0% <100.0%> (ø)
evalml/tests/automl_tests/test_search.py	100.0% <100.0%> (ø)

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[jeremyliweishih]

Looks great! Just had some comments on docstring updates.