Added read Decimal from parquet

[potter420]

Hi,

This pull request address the issue #444

Thanks,

[jorgecarleitao]

This looks awesome, really great work here. Let me release a new parquet2 before we merge this so that we keep master releasable.

[codecov]

Codecov Report

Merging #489 (65512e7) into main (a15044a) will decrease coverage by 0.07%.
The diff coverage is 86.86%.

@@            Coverage Diff             @@
##             main     #489      +/-   ##
==========================================
- Coverage   80.33%   80.26%   -0.08%     
==========================================
  Files         374      380       +6     
  Lines       22919    23464     +545     
==========================================
+ Hits        18413    18834     +421     
- Misses       4506     4630     +124     

Impacted Files	Coverage Δ
src/io/parquet/read/schema/metadata.rs	79.06% <ø> (ø)
src/io/parquet/read/statistics/fixlen.rs	44.18% <44.18%> (ø)
src/io/parquet/read/mod.rs	60.00% <94.11%> (+6.98%)	⬆️
src/io/parquet/write/fixed_len_bytes.rs	90.69% <94.44%> (+2.23%)	⬆️
src/io/parquet/read/schema/convert.rs	91.31% <100.00%> (+0.83%)	⬆️
src/io/parquet/read/statistics/mod.rs	72.00% <100.00%> (+2.43%)	⬆️
src/io/parquet/read/statistics/primitive.rs	72.00% <100.00%> (+2.43%)	⬆️
tests/it/io/parquet/mod.rs	95.92% <100.00%> (+1.01%)	⬆️
tests/it/io/parquet/read.rs	98.76% <100.00%> (+0.21%)	⬆️
tests/it/io/parquet/write.rs	100.00% <100.00%> (ø)
... and 56 more

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