feat: support to read tinyint

[WenyXu]

Support to read tinyint data

close #17

[codecov]

Codecov Report

Attention: 7 lines in your changes are missing coverage. Please review.

Comparison is base (47bb450) 73.75% compared to head (995e0f3) 79.35%.
Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #22      +/-   ##
==========================================
+ Coverage   73.75%   79.35%   +5.60%     
==========================================
  Files          27       29       +2     
  Lines        2343     2499     +156     
==========================================
+ Hits         1728     1983     +255     
+ Misses        615      516      -99     

Flag	Coverage Δ
rust	79.35% <96.41%> (+5.60%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
src/arrow_reader/column.rs	92.96% <100.00%> (ø)
src/arrow_reader/column/date.rs	92.30% <100.00%> (+0.64%)	⬆️
src/arrow_reader/column/tinyint.rs	100.00% <100.00%> (ø)
src/async_arrow_reader.rs	79.83% <100.00%> (+0.52%)	⬆️
src/error.rs	0.00% <ø> (ø)
src/reader/metadata.rs	97.29% <100.00%> (+0.23%)	⬆️
src/arrow_reader.rs	85.46% <87.50%> (+6.47%)	⬆️
src/reader/decompress.rs	94.04% <97.33%> (+13.37%)	⬆️
src/reader/decode/byte_rle.rs	94.80% <94.80%> (ø)

... and 6 files with indirect coverage changes

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[Jefffrey]

I think TinyInt should map to i8 and not u8

Can see Arrow cpp reference here maps it to Int8 datatype:

https://arrow.apache.org/docs/cpp/orc.html

[WenyXu]

@Jefffrey I mapped it to i8, PTAL

[Jefffrey]

Thanks, looks good