PyPulseq-Star replacement test suite

Files:
- pytest.ini
- run_tests.py
- tests/README.md
- tests/__init__.py
- tests/conftest.py
- tests/helpers/__init__.py
- tests/helpers/builders.py
- tests/integration/__init__.py
- tests/integration/test_four_demos.py
- tests/integration/test_installation.py
- tests/integration/test_writer_roundtrip.py
- tests/unit/__init__.py
- tests/unit/test_dashboard.py
- tests/unit/test_events.py
- tests/unit/test_plotter.py
- tests/unit/test_relationships.py
- tests/unit/test_sequence.py
- tests/unit/test_shapes.py
- tests/unit/test_writers.py
