test: add comprehensive unit tests for tar-diff package #186

Job	Run time
Build and test on Windows (windows-latest)	2m 12s
Build and test Fedora on multiple runners (ubuntu-24.04-arm)	1m 4s
Build and test Fedora on multiple runners (ubuntu-latest)	1m 4s
Build and test on Windows (windows-11-arm)	3m 54s
Build and test makefile	49s
Build and test on macOS (macos-26-intel)	1m 58s
Build and test on macOS (macos-latest)	56s
version-release	0s
	11m 57s

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