Sokoban: Add world3-003 and world3-004

PR: https://github.com/DoctorLai/sokoban-web/pull/27

world3-003

https://doctorlai.github.io/sokoban-web/?level=world3-003

world3-004

https://doctorlai.github.io/sokoban-web/?level=world3-004

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