Update to the .NET 8 SDK and use some new C# features. #362
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Similar to #141, this PR updates the required version of the .NET SDK to .NET 8, and uses some new and less new C# language features along the way. We update the SDK primarily because .NET 7 will go out of support in May 2024, and to enable updating the ClangSharpPInvokeGenerator whose latest version runs on .NET 8.
Like the previous PR, this does not affect the C# API's runtime targeting of .NET 5. .NET 8 will be required only to build it from source.