Simplified API to get page iterator

[jorgecarleitao]

old:

pub fn get_page_iterator<'a, RR: Read + Seek>(metadata: &FileMetaData, row_group: usize, column: usize, ...)

new:

pub fn get_page_iterator<'a, RR: Read + Seek>(column_metadata: &ColumnChunkMetaData, ...)

it makes it a bit more explicit and users usually already get the column metadata, to get the file descriptor and stats (code duplication of consumers).

To migrate,

before:

let compressed_pages = get_page_iterator(&metadata, row_group, column, &mut file, file)?.collect()?;

after:

let column_meta = metadata.row_groups[row_group].column(column);
let compressed_pages = get_page_iterator(column_meta, &mut file, file)?.collect()?;

[codecov-commenter]

Codecov Report

Merging #36 (d968bde) into main (450c99d) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #36      +/-   ##
==========================================
+ Coverage   67.10%   67.13%   +0.02%     
==========================================
  Files          63       63              
  Lines        3481     3484       +3     
==========================================
+ Hits         2336     2339       +3     
  Misses       1145     1145              

Impacted Files	Coverage Δ
src/read/mod.rs	90.80% <100.00%> (+0.16%)	⬆️

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