add tar-fs

[gameroman]

Summary by CodeRabbit

• New Features
  • Added a tar filesystem package for creating and extracting archives with filtering, path stripping, symlink handling, and permission/mtime controls.
• Tests
  • Added comprehensive integration tests exercising pack/extract flows, mapping, strip/dereference options, and safety edge cases.
• Chores
  • Added package metadata, build/test config, typegen config, test fixtures, and ignore rules.