test binary module and rename things for clarity

wait for !17 (merged)

changelog

• add bytes from_int: [int -> binary, list<int> -> binary] to binary.nu
• add bytes to_int: binary -> list<int> to binary.nu
• add tests/binary.nu to test binary.nu
• run tests/binary.nu in the CI
• for clarity
  • rename BYTES to FILE in tests/cli.nu
  • rename bytes to input in komodo.nu