Add codebase audit workflow for analyzing existing code #482

Job	Run time
Build Regorus FFI: (aarch64-apple-darwin)	4m 23s
Build Regorus FFI: (x86_64-pc-windows-msvc)	6m 52s
Build Regorus FFI: (x86_64-unknown-linux-gnu)	3m 42s
Build Regorus nuget	53s
Test Regorus Nuget: (x86_64-unknown-linux-gnu)	55s
Test Regorus Nuget: (aarch64-apple-darwin)	57s
Test Regorus Nuget: (x86_64-pc-windows-msvc)	2m 15s
	19m 57s

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