v0.3.0

Added

• Python constructors to all types.
• Properties with getter and setters for all remaining Record fields.
• Documentation with API reference at https://gb-io.readthedocs.io.

Changed

• Bump pyo3 dependency to v0.20.
• Add wheels for Python 3.11 and 3.12.
• Reorganize code to facilitate object creation.
• Implement copy-on-access for Record and Feature attributes.
• strand property to some common Location types.
• Make Record.sequence a bytearray to allow changing the sequence content.