Polars: py-0.15.3 Release

🚀 Performance improvements

• set_sorted flag when creating from literal (#5728)
• use sorted fast path in streaming groupby (#5727)

✨ Enhancements

• push down predicates to pyarrow datasets (#5780)
• Support for reading delta lake tables (#5761)
• Add DataFrame.glimpse() (#5622)
• allow expression as quantile input (#5751)
• accept expression in str.extract_all (#5742)
• tz-aware strptime (#5736)
• lazy diagonal concat. (#5647)
• to_struct add upper_bound (#5714)

🐞 Bug fixes

• fix(rust, python) Summation on empty series evaluates to Some(0) (#5773)
• empty concat utf8 (#5768)
• projection pushdown with union and asof join (#5763)
• check null values in asof_join + groupby (#5756)
• fix generic streaming groupby on logical types (#5752)
• fix date_range on expressions (#5750)
• fix dtypes in join_asof_by (#5746)
• fix group order in binary aggregation (#5744)
• implement min/max aggregation for utf8 in groupby (#5737)
• fix all_null/sorted into_groups panic (#5733)
• address several edge-cases found when asserting NaN equality (#5732)
• asof join 'by', 'forward' combination (#5720)

🛠️ Other improvements

• add DataFrame.pearson_corr to reference (#5772)
• Parse fixed timezone offsets without pytz (#5769)
• chore(rust,python) Change allow_streaming to streaming (#5747)
• Remove pyarrow nightlies requirement. (#5719)
• fix incorrect accepted type in df.write_csv (#5715)

Thank you to all our contributors for making this release possible! @AnatolyBuga, @MarcoGorelli, @alexander-beedie, @andrewpollack, @braaannigan, @chitralverma, @ghuls, @ritchie46, @sa- and @zundertj