Add row and col scaling functions to distributed matrix

[fritzgoebel]

This PR adds a row_scale and a col_scale function to the distributed matrix. This functionality is needed in openCARP.

• The row scaling is straight forward, with a distributed vector of scaling coefficients that has the same row partitioning as the matrix, we can just scale the rows of local and non-local matrices with the local vectors.
• For column scaling, we need to communicate the non-local scaling coefficients to scale the columns of the non-local matrices. This can be simply done with the matrix's communicate.

[MarcelKoch]

LGTM. That is a lot simpler than I expected.

[sonarcloud]

Quality Gate passed

Issues
19 New issues
0 Accepted issues

Measures
0 Security Hotspots
56.1% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[codecov]

Codecov Report

Attention: Patch coverage is 98.18182% with 1 line in your changes missing coverage. Please review.

Project coverage is 90.26%. Comparing base (6c0da56) to head (e8b7c5b).
Report is 38 commits behind head on develop.

Files	Patch %	Lines
core/distributed/matrix.cpp	95.65%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1640      +/-   ##
===========================================
+ Coverage    90.01%   90.26%   +0.24%     
===========================================
  Files          759      759              
  Lines        61173    61204      +31     
===========================================
+ Hits         55067    55243     +176     
+ Misses        6106     5961     -145     

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[upsj]

This seems to assume that the scaling factors have unit stride - that's not necessarily true