#2219: Add UnpackCommandlet for extracting already supported archieve Formats

[majesteSil]

This PR fixes #2219

Adds a new "unpack" commandlet that extracts archive files into a target directory. The commandlet supports ZIP, TAR, TAR.GZ, TAR.BZ2, 7Z, JAR (cross-platform) and notes platform-specific formats like MSI/DMG/PKG. The commandlet is registered in the commandlet manager and covered by unit tests.

Implemented changes:

• Modified: CommandletManagerImpl (registers new commandlet)
• Added: UnpackCommandlet (new commandlet implementation)
• Added: UnpackCommandletTest (unit tests)

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