Python Polars 0.16.14

🚀 Performance improvements

• optimize string kernels, (elide redundant allocs) (#7602)
• even faster polars module import (~15%) (#7584)
• optimize str_replace for same length replacements ~2x (#7580)
• reinstate fast module import and optimise DataFrame init by implementing dynamic singledispatch registration (#7559)
• improve perf or str.replace_n and add n argument ~10x (#7575)
• speedup replace_literal_all of single byte replacements ~15x. (#7565)
• set sorted flags (#7558)
• extend ultrafast constant-value frame init to temporal types (over 1,000x speedup) (#7527)

✨ Enhancements

• slightly more space-efficient table output (use ellipsis char, not three periods) (#7599)
• implement decimal -> dtype cast (#7600)
• use head on pyarrow datasets (#7570)
• overwrite streaming chunk size (#7543)

🐞 Bug fixes

• remove index columns in pandas to_sql() (#7596)
• add decimal chunk_lengths (#7589)
• fix ooc sort. the fast path was invalid (#7588)
• Fix regression throwing AmbiguousTimeError in groupby_dynamic (#7454)
• activate dtype-duration for polars-ops (#7582)
• distinct project whole schema if not a subset (#7581)
• reinstate fast module import and optimise DataFrame init by implementing dynamic singledispatch registration (#7559)
• sql window functions (#7458)
• respect time zone in upsample (#7563)
• fix rolling windows for windows that shrink from lhs (#7556)
• remove pyarrow from construction and dispatch to rust (#7551)
• fix negative indexing for head/tail (#7554)
• Remove BatchedCsvReader from public API (#7546)
• fix logical/list getitem (#7545)
• pushdown key in merge sorted projection pd (#7542)
• don't upcast column to string in 'is_in' operation (#7538)

🛠️ Other improvements

• Move more code out of internals (#7597)
• add a performance hint about use of lru_cache to the apply docstrings (#7593)
• Avoid pli in type hints (part 2) (#7587)
• Avoid pli in type hints (part 1) (#7586)
• Move core objects to top level (#7576)
• Bump ruff (#7567)
• Rename namespace Array -> List in docs (#7541)
• Move fmt tests to test_fmt (#7555)
• Rename sep arg to separator (#7533)
• Minor Series cleanup (#7531)

Thank you to all our contributors for making this release possible!
@MarcoGorelli, @Vincenthays, @alexander-beedie, @ritchie46, @stinodego, @universalmind303 and @vincev