v3.0.0b4

What's Changed

• fix(core): gracefully handle missing keys by @hassiebp in https://github.com/langfuse/langfuse-python/pull/1200
• feat(scores): add session and dataset run scores by @hassiebp in https://github.com/langfuse/langfuse-python/pull/1201

Full Changelog: https://github.com/langfuse/langfuse-python/compare/v3.0.0b3...v3.0.0b4