Add net10.0 target framework while preserving out-of-support frameworks

[Copilot]

Description

Adds net10.0 to the main library's target frameworks to align with CI/CD workflow requirements, while preserving all existing out-of-support frameworks per project maintainer request.

Type of change

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

How Has This Been Tested?

• Build verification for net10.0 specifically
• Build verification for all 13 target frameworks
• No warnings or errors produced

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

The CI/CD workflow in .github/workflows/pr.yaml attempts to build net10.0 but the project only targeted up to net9.0. This change resolves the mismatch by adding net10.0 to the TargetFrameworks property in Wolfgang.Etl.Abstractions.csproj.

All out-of-support frameworks remain intact:

• .NET Framework: net462, net472, net48, net481
• .NET Core: netcoreapp3.1
• Modern .NET: net5.0, net6.0, net7.0

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