test: add comprehensive unit tests for tar-diff package #182

Job	Run time
Build and test Fedora on multiple runners (ubuntu-latest)	58s
Build and test Fedora on multiple runners (ubuntu-24.04-arm)	58s
Build and test on Windows (windows-latest)	2m 18s
Build and test on Windows (windows-11-arm)	2m 34s
Build and test on macOS (macos-26-intel)	1m 27s
Build and test makefile	44s
Build and test on macOS (macos-latest)	1m 9s
version-release	-1s
	10m 7s

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