Add .NET 10.0 target framework support

[Copilot]

Description

The release workflow was configured to build for net10.0, but the project file only targeted frameworks up to net9.0, causing build failures.

Added net10.0 to TargetFrameworks in Wolfgang.Etl.Abstractions.csproj to align with the release workflow configuration.

Type of change

• Bug fix
• New feature
• Breaking change
• Documentation update
• Refactor

How Has This Been Tested?

• Built project for net10.0 framework specifically
• Built project for all target frameworks to verify compatibility

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

Screenshots (if applicable)

N/A

Additional context

This change is part of addressing feedback on PR #41 for .NET 10 and release automation updates. The project now successfully builds for all 13 target frameworks including the newly added net10.0.

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