v0.3.2: Stats for performance. Quality of Life improvements in `to_dataset()`.

What's Changed

• Exact table statistics for the optimizer (DataFusion 54) by @alxmrs in #201
• fix: register dimensions without coordinates as columns by @ghostiee-11 in #216
• fix: infer surviving dims in to_dataset for aggregations (closes #189) by @ghostiee-11 in #218

Full Changelog: v0.3.1...v0.3.2