test sortedness propagation

[ritchie46]

See https://stackoverflow.com/a/72466798/6717054 how we by simply propagating metadata can ensure we have the really fast happy paths.

[codecov-commenter]

Codecov Report

Merging #3560 (25430a0) into master (a98438b) will decrease coverage by 0.00%.
The diff coverage is 84.00%.

@@            Coverage Diff             @@
##           master    #3560      +/-   ##
==========================================
- Coverage   77.60%   77.59%   -0.01%     
==========================================
  Files         425      425              
  Lines       71298    71374      +76     
==========================================
+ Hits        55331    55385      +54     
- Misses      15967    15989      +22     

Impacted Files	Coverage Δ
...polars-core/src/series/implementations/duration.rs	23.09% <0.00%> (-0.16%)	⬇️
polars/polars-core/src/series/series_trait.rs	22.43% <0.00%> (ø)
polars/polars-core/src/frame/explode.rs	94.50% <54.54%> (-1.57%)	⬇️
...lars-core/src/series/implementations/dates_time.rs	56.60% <83.33%> (+0.05%)	⬆️
...polars-core/src/series/implementations/datetime.rs	44.46% <83.33%> (+0.39%)	⬆️
...s/polars-core/src/series/implementations/floats.rs	64.02% <83.33%> (+0.21%)	⬆️
...ars/polars-core/src/series/implementations/utf8.rs	69.89% <83.33%> (+0.18%)	⬆️
...lars/polars-core/src/series/implementations/mod.rs	79.37% <100.00%> (+0.16%)	⬆️
polars/polars-lazy/src/frame/mod.rs	88.31% <100.00%> (+0.34%)	⬆️
py-polars/src/series.rs	77.13% <100.00%> (+0.26%)	⬆️
... and 9 more

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