add auto featurizer api

[LittleLittleCloud]

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This PR includes API for auto featurizer

usage

// data, context

// infer column information from data
var pipeline = context.Auto().Featurizer(data, excludeColumnNames: new[] {"Label"})
                      .Append(context.Auto().BinaryClassification("Label");

// using auto().InferColumns
var columnInfo = context.Auto().InferColumn(data);
var pipeline = context.Auto().Featurizer(columnInfo.Columns, excludeColumnNames: new[]{"Label"})
...

[codecov]

Codecov Report

Merging #6187 (50facc5) into main (97a920a) will increase coverage by 0.05%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #6187      +/-   ##
==========================================
+ Coverage   68.29%   68.35%   +0.05%     
==========================================
  Files        1098     1103       +5     
  Lines      242080   242513     +433     
  Branches    25166    25204      +38     
==========================================
+ Hits       165326   165764     +438     
+ Misses      70187    70178       -9     
- Partials     6567     6571       +4     

Flag	Coverage Δ
Debug	68.35% <ø> (+0.05%)	⬆️
production	62.79% <ø> (+0.03%)	⬆️
test	88.86% <ø> (+0.05%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...st/Microsoft.ML.SearchSpace.Tests/ParameterTest.cs	100.00% <0.00%> (ø)
...Microsoft.ML.SearchSpace.Tests/ChoiceOptionTest.cs	100.00% <0.00%> (ø)
src/Microsoft.ML.SearchSpace/Option/NestOption.cs	54.79% <0.00%> (ø)
...t/Microsoft.ML.SearchSpace.Tests/NestOptionTest.cs	100.00% <0.00%> (ø)
.../Microsoft.ML.AutoML.Tests/CostFrugalTunerTests.cs	96.44% <0.00%> (ø)
.../Microsoft.ML.AutoML.Tests/GridSearchTunerTests.cs	84.00% <0.00%> (ø)
...ft.ML.SearchSpace/Attribute/NestOptionAttribute.cs	100.00% <0.00%> (ø)
...ML.Transforms/Text/StopWordsRemovingTransformer.cs	86.38% <0.00%> (+0.14%)	⬆️
src/Microsoft.ML.Core/Utilities/Contracts.cs	45.47% <0.00%> (+0.20%)	⬆️
...soft.ML.SearchSpace/Option/UniformNumericOption.cs	97.46% <0.00%> (+1.26%)	⬆️
... and 7 more

[michaelgsharp]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 2 pipeline(s).