Add default param grid for xgboost

[kinfaikan]

Related issues
XGBoost does not have default param grid.

Describe the proposed solution
XGBoost has quite many hyperparameters. Consider only numRound, eta, maxDepth, and minChildWeight in default param grid.

Describe alternatives you've considered
NA

Additional context
NA

[tovbinm]

@kinfaikan please add xgboost to model selector enums and tests

[tovbinm]

@kinfaikan please mixin OpXGBoostQuietLogging trait into tests to avoid unnecessary logging.

[tovbinm]

lgtm

[codecov]

Codecov Report

Merging #175 into master will increase coverage by 17.35%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##           master     #175       +/-   ##
===========================================
+ Coverage   68.93%   86.28%   +17.35%     
===========================================
  Files         305      305               
  Lines        9967     9977       +10     
  Branches      336      548      +212     
===========================================
+ Hits         6871     8609     +1738     
+ Misses       3096     1368     -1728

Impacted Files	Coverage Δ
...p/stages/impl/selector/DefaultSelectorParams.scala	100% <100%> (ø)	⬆️
...ages/impl/regression/RegressionModelSelector.scala	95.23% <100%> (+0.5%)	⬆️
...sification/BinaryClassificationModelSelector.scala	96.15% <100%> (+0.5%)	⬆️
...ssification/MultiClassificationModelSelector.scala	95.23% <100%> (+68.92%)	⬆️
.../salesforce/op/features/FeatureBuilderMacros.scala	0% <0%> (-100%)	⬇️
.../op/features/types/FeatureTypeSparkConverter.scala	99.06% <0%> (+0.93%)	⬆️
...scala/com/salesforce/op/features/FeatureLike.scala	42.39% <0%> (+1.08%)	⬆️
...op/stages/impl/selector/ModelSelectorSummary.scala	91.3% <0%> (+1.08%)	⬆️
...rce/op/stages/impl/feature/PhoneNumberParser.scala	100% <0%> (+1.29%)	⬆️
...com/salesforce/op/evaluators/OpEvaluatorBase.scala	90.47% <0%> (+1.58%)	⬆️
... and 104 more

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