Add .NET 10 support and update packages to resolve vulnerabilities

[nieprzecietny]

This commit adds multi-targeting support for .NET 10 across all library and test projects, and updates critical packages to address security vulnerabilities and maintain open-source licensing.

.NET 10 Multi-Targeting

• Updated 12 library projects to target net8.0, net9.0, and net10.0
• Added framework-specific package references with version aliases (10.* for .NET 10)
• Updated 5 test projects to target net10.0
• All projects build successfully across all target frameworks

Package Updates

MediatR (12.0.1 → 12.5.0)

• Updated to last Apache-2.0 licensed version before commercial transition
• Updated in: MediatR, MediatR.Caching, MediatR.Email, MediatR.PagedRequest
• Maintains open-source licensing for project sustainability

Microsoft.ML Packages (Security Fix)

• Fixed high severity SkiaSharp vulnerability (GHSA-j7hp-h8jx-5ppr)
• Microsoft.ML: 2.0.1 → 5.0.0
• Microsoft.ML.ImageAnalytics: 2.0.1 → 5.0.0
• Microsoft.ML.Vision: 2.0.1 → 5.0.0
• Microsoft.Extensions.ML: 2.0.1 → 5.0.0
• Microsoft.ML.AutoML: 0.20.1 → 0.23.0
• Updated Microsoft.Extensions.* references for net8.0 to 9.* to satisfy dependencies

Scrutor (6.1.0 → 7.0.0)

• Updated to latest stable version in MediatR project

Verification

• Build: Successful (0 errors, warnings pre-existing)
• Vulnerability Scan: All 20 projects now have NO vulnerable packages
• Tests: 39 total, 36 passed, 3 skipped (integration tests requiring manual setup), 0 failed

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 34.96%. Comparing base (f2f9b5e) to head (a4b9f21).
⚠️ Report is 6 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #22   +/-   ##
=======================================
  Coverage   34.96%   34.96%           
=======================================
  Files          89       89           
  Lines        1470     1470           
  Branches      119      119           
=======================================
  Hits          514      514           
  Misses        947      947           
  Partials        9        9           

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