Add methods to draw a scatter plot matrix of a DataFrame

[hernanmd]

Usage example using PCA:

	| d m pca m1 d1 irisDataFrame |
	
	irisDataFrame := AIDatasets loadIris.
	d := irisDataFrame columnsFrom: 1 to: 4.

	"Transform DF  as matrix"
	m := PMMatrix rows: d asArrayOfRows.

	"Data standardization (mean = 0 and variance = 1)"
	m := PMStandardizationScaler new fitAndTransform: m.

	"Compute PCA components"
	pca := PMPrincipalComponentAnalyserSVD new.
	pca componentsNumber: 2.
	pca fit: m.
	pca transformMatrix.

	m1 := pca transform: m.

	d1 := DataFrame withRows: m1 rows.
	d1
		addColumn: (irisDataFrame columnsFrom: 5 to: 5) asArrayOfColumns first
		named: 'type'.
		
	d1 	
		openScatterPlotWithTitle: 'PCA of Iris data set' 
		forColumn: 'type'.

[jecisc]

Hi hernan,

We do not want graphical interfaces in the project DataFrame directly because we do not want to depend on Roassal for a Collection.

The UI part should be in this project:

https://github.com/pharo-ai/data-inspector

Also, a few weeks ago I implemented a scatter matrix in this project. You can check the readme to see how to use it and check if this version is good enough or if you want to improve this implementation

[hernanmd]

Hi Cyril,

I checked data inspector, it implements scatter matrix, but I didn't find a single scatter plot.
So I will push there.