ENH: Implement run_eagerly parameter

[adriangb]

Closes #53

[codecov-commenter]

Codecov Report

Merging #55 into master will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master      #55   +/-   ##
=======================================
  Coverage   99.51%   99.51%           
=======================================
  Files           3        3           
  Lines         414      415    +1     
=======================================
+ Hits          412      413    +1     
  Misses          2        2           

Impacted Files	Coverage Δ
scikeras/wrappers.py	99.70% <100.00%> (+<0.01%)	⬆️

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