python-v1.2.1: lazy writes

Performance improvements

• feat: in-flight, streaming PartitionWriter by @abhiaagarwal in #3857
• fix: use single writer for all partition streams by @ion-elgreco in #3870

What's Changed

• feat: datafusion based kernel engine by @roeap in #3831
• fix: update pyproject.toml by @wagenrace in #3854
• chore: upgrade datafusion, arrow and parquet by @dentiny in #3856
• feat: allow RecordBatchWriter to pass through pass-through-commit-properties by @rtyler in #3858
• perf: support pushing physical filters down through DeltaScan by @alexwilcoxson-rel in #3859
• chore: remove some deprecated methods by @roeap in #3861
• fix: resolve some warnings by @roeap in #3862
• chore: deprecate file_actions on state by @roeap in #3863
• refactor: consolidate datafusion session setup by @roeap in #3860
• fix(core): handle Result type after get_actions sync conversion by @yousefsaad12 in #3846
• chore: change the core and meta crate versions for release by @rtyler in #3864
• chore: use form based issue templates by @roeap in #3865
• chore: add python deprecation warnings by @roeap in #3869
• feat(bench): add TPC-DS benchmarks by @abhiaagarwal in #3845
• fix: add regression test for working with dotted-named columns in Python by @rtyler in #3873
• fix: add a regression test while I'm tooting around by @rtyler in #3874
• feat: allow for lazy loading files in operations by @roeap in #3872

New Contributors

• @wagenrace made their first contribution in #3854
• @dentiny made their first contribution in #3856
• @yousefsaad12 made their first contribution in #3846

Full Changelog: python-v1.2.0...python-v1.2.1