Release v0.2.0

Changes

• Migrate to Poetry v2 and project-managed Poetry plugins
• Move configuration into pyproject.toml for pytest, mypy & coverage
• Upgrade to gha-shared-workflows@v8 for Poetry v2 support
• Migrate from pendulum to arrow for dates (interface change)
• Update all dependencies and outdated constraints

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⚠️ Note: The migration from pendulum to arrow is a breaking change that may be backwards-incompatible for some clients. See PR #63 for more details.