updated tests for world shape

examples/example_basic.ipynb

examples/example_basic.py

examples/example_readme.py

src/robofish/io/app.py

tests/resources/invalid.hdf5

tests/resources/nan_test.hdf5

tests/resources/valid_1.hdf5

tests/resources/valid_2.hdf5

tests/robofish/evaluate/test_app_evaluate.py

tests/robofish/io/test_entity.py

tests/robofish/io/test_file.py