Creation of components through MLContext and cleanup (GcnNorm, LpNorm, RandomFourier, CustomStopWords, VectorWhiten, PCA)

[artidoro]

This PR is part of the work outlined in #1798, and focuses on the GcnNorm, LpNorm, RandomFourier, CustomStopWords, VectorWhiten, PCA transformers/estimators:

1. Internalize constructors of estimators and transformers
2. Keep ColumnInfo and move it to to the estimators The ColumnInfo structure should live in the estimators, rather than transformers #1760
3. Rename Arguments -> Options
4. Internalize Options only when they are not used by public constructor. For all other cases, retain Options as public Arguments class should be made internal when possible #1758

fixes #2275

If I wrote (not a ITransformer) on the #1798 issue, and this PR number appears on the same line, I renamed the Arguments to Options, and tried to make it internal.

[codecov]

Codecov Report

Merging #2366 into master will decrease coverage by 0.08%.
The diff coverage is 78.07%.

@@            Coverage Diff             @@
##           master    #2366      +/-   ##
==========================================
- Coverage   71.26%   71.17%   -0.09%     
==========================================
  Files         785      780       -5     
  Lines      140946   140404     -542     
  Branches    16108    16053      -55     
==========================================
- Hits       100440    99936     -504     
+ Misses      36039    36017      -22     
+ Partials     4467     4451      -16

Flag	Coverage Δ
#Debug	71.17% <78.07%> (-0.09%)	⬇️
#production	67.56% <75.94%> (-0.05%)	⬇️
#test	85.18% <100%> (-0.14%)	⬇️

[Ivanidzo4ka]

    public VectorWhiteningTransformer Fit(IDataView input)

/// <summary>
    /// Train and return a transformer.
    /// </summary> #Closed

---

Refers to: src/Microsoft.ML.HalLearners/VectorWhitening.cs:806 in 78a287e. [](commit_id = 78a287e, deletion_comment = False)

[rogancarr]

LGTM.

Just a few comments about adding more information in the docs. If this isn't the appropriate PR for adding detailed docs info, can you make sure they are listed in #1209 as a to-do?

[Ivanidzo4ka]

[zeahmed]