Add new matrix methods for DenseMatrix

[SylvestreSakti]

Please check if the PR fulfills these requirements

• The commit message follows our guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

Does this PR already have an issue describing the problem?
This PR adresses multiple needs :

• This issue : Copy of matrix values without allocating new memory space #3194
• This comment PR in OpenLoadFlow which needs emptyMatrix singleton : Add PST Actions in Fast DC Security Analysis powsybl-open-loadflow#1095 (comment)
• The already existing class MatrixUtil in OpenLoadFlow

What kind of change does this PR introduce?
This PR introduces 4 new methods in DenseMatrix

• Copying values from another DenseMatrix
• Resetting a specific row of a DenseMatrix
• Resetting a specific column of a DenseMatrix
• Remove small values of a DenseMatrix

It introduces also a new final static object EMPTY for empty matrix.

What is the current behavior?
Currently these methods are implemented in OpenLoadFlow but they are concerning DenseMatrix operations so it would be cleaner to have them in powsybl-core

What is the new behavior (if this is a feature change)?

These methods have been moved :

• From powsybl.openloadflow.sensi.DcSensitivityAnalysis :
  private static void matrixCopyValues(DenseMatrix originalMatrix, DenseMatrix copyMatrix)
  => To powsybl.math.matrix.DenseMatrix :
  public void copyValuesFrom(DenseMatrix originalMatrix)

• From powsybl.openloadflow.util.MatrixUtil :
  public static void resetRow(DenseMatrix m, int row)
public static void resetColumn(DenseMatrix m, int column)
public static void clean(DenseMatrix m, double epsilonValue)
  => To powsybl.math.matrix.DenseMatrix :
  public void resetRow(int row)
public void resetColumn(int column)
public void removeSmallValues(double epsilonValue)

• From powsybl.openloadflow.sensi.WoodburyEngine (in https://github.com/powsybl/powsybl-open-loadflow/pull/1095/files/f69a2011d21da80c0483d2f68a78295feb541592#diff-cccda1bb06d9d483f786ebdf66343e1d85e9728488bedcf9f9bf732ed4ca610d) :
  public static class EmptyDenseMatrix
  => To powsybl.math.matrix.DenseMatrix :
  public static final DenseMatrix EMPTY

Does this PR introduce a breaking change or deprecate an API?

• Yes
• No (MatrixUtil class in OpenLoadFlow will be kept as deprecated)

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
94.2% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud