Simplified PageIterator

[jorgecarleitao]

• Renamed it to PageReader
• Added trait PageIterator
• Removed internal state for page index, since page indexes are only present in metadata

[codecov-commenter]

Codecov Report

Merging #103 (5fdb81d) into main (e499570) will increase coverage by 0.24%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #103      +/-   ##
==========================================
+ Coverage   68.08%   68.32%   +0.24%     
==========================================
  Files          72       72              
  Lines        3910     3927      +17     
==========================================
+ Hits         2662     2683      +21     
+ Misses       1248     1244       -4     

Impacted Files	Coverage Δ
src/parquet_bridge.rs	23.07% <ø> (+0.57%)	⬆️
src/write/column_chunk.rs	0.00% <ø> (ø)
src/read/compression.rs	79.45% <100.00%> (+0.28%)	⬆️
src/read/mod.rs	93.46% <100.00%> (-0.75%)	⬇️
src/read/page/reader.rs	85.18% <100.00%> (ø)
src/error.rs	20.00% <0.00%> (-2.23%)	⬇️
src/lib.rs	79.20% <0.00%> (+0.48%)	⬆️
src/statistics/binary.rs	5.55% <0.00%> (+5.55%)	⬆️
src/metadata/column_chunk_metadata.rs	63.76% <0.00%> (+13.76%)	⬆️

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