Removed Count (parquet statistics)

[jorgecarleitao]

This level of indirection is not required (since we already have Array for dynamic typing). It makes it easier to handle statistics.

[codecov]

Codecov Report

Merging #1217 (12617c9) into main (838deca) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1217      +/-   ##
==========================================
- Coverage   83.17%   83.17%   -0.01%     
==========================================
  Files         358      358              
  Lines       37255    37244      -11     
==========================================
- Hits        30986    30976      -10     
+ Misses       6269     6268       -1     

Impacted Files	Coverage Δ
src/io/parquet/read/statistics/mod.rs	87.83% <100.00%> (-0.32%)	⬇️
src/bitmap/utils/slice_iterator.rs	98.78% <0.00%> (+1.21%)	⬆️

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