Add some convenient constructors for NumMatrix and NumVector

[grospelliergilles]

• Allow conversion from NumVector to a NumMatrix with one row.
• Allow implicit conversion from std::array and T[N] to NumVector.

[sonarqubecloud]

Quality Gate failed

Failed conditions
C Maintainability Rating on New Code (required ≥ A)

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 71.58%. Comparing base (bbf244b) to head (0b131a3).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
arccore/src/base/arccore/base/NumMatrix.h	0.00%	3 Missing ⚠️
arccore/src/base/arccore/base/NumVector.h	0.00%	2 Missing ⚠️

❌ Your patch check has failed because the patch coverage (0.00%) is below the target coverage (50.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2784      +/-   ##
==========================================
+ Coverage   71.56%   71.58%   +0.01%     
==========================================
  Files        2565     2565              
  Lines      194005   194008       +3     
  Branches    23032    23032              
==========================================
+ Hits       138847   138887      +40     
+ Misses      46569    46532      -37     
  Partials     8589     8589              

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