write ColumnMetaData instead of ColumnChunk after pages.

[youngsofun]

https://github.com/apache/parquet-format/blob/master/src/main/thrift/parquet.thrift#L792

[codecov-commenter]

Codecov Report

Merging #90 (1e542ed) into main (e09a698) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #90   +/-   ##
=======================================
  Coverage   67.60%   67.60%           
=======================================
  Files          69       69           
  Lines        3831     3831           
=======================================
  Hits         2590     2590           
  Misses       1241     1241           

Impacted Files	Coverage Δ
src/write/column_chunk.rs	0.00% <ø> (ø)

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[jorgecarleitao]

Thanks, @youngsofun , indeed!