update boolean aggregates and ensure they return IdxSize

[ritchie46]

fixes #3511

[codecov-commenter]

Codecov Report

Merging #3563 (9851d99) into master (f1df2cb) will decrease coverage by 7.87%.
The diff coverage is 90.47%.

@@            Coverage Diff             @@
##           master    #3563      +/-   ##
==========================================
- Coverage   77.57%   69.69%   -7.88%     
==========================================
  Files         425      425              
  Lines       71364    71356       -8     
==========================================
- Hits        55362    49733    -5629     
- Misses      16002    21623    +5621     

Impacted Files	Coverage Δ
...ars/polars-core/src/chunked_array/ops/aggregate.rs	93.70% <90.47%> (-0.55%)	⬇️
polars/polars-io/src/tests.rs	0.00% <0.00%> (-100.00%)	⬇️
polars/polars-lazy/src/lib.rs	0.00% <0.00%> (-100.00%)	⬇️
polars/polars-time/src/lib.rs	0.00% <0.00%> (-100.00%)	⬇️
polars/polars-utils/src/lib.rs	0.00% <0.00%> (-100.00%)	⬇️
polars/polars-io/src/prelude.rs	0.00% <0.00%> (-100.00%)	⬇️
polars/polars-time/src/windows/test.rs	0.00% <0.00%> (-100.00%)	⬇️
...s-lazy/src/physical_plan/expressions/group_iter.rs	0.00% <0.00%> (-94.00%)	⬇️
polars/polars-io/src/parquet/mod.rs	0.00% <0.00%> (-93.55%)	⬇️
polars/polars-lazy/src/dsl/options.rs	0.00% <0.00%> (-88.89%)	⬇️
... and 172 more

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