Build and Publish NuGet Package for all supported platforms

Fixes #11 Use separate nuspec files for different architechtures #16

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Run time

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Job	Run time
get-version	1s
build-windows-x64	2m 27s
build-macos-x64	39s
build-macos-arm64	19s
build-linux-x64	37s
	4m 3s