feat: support to struct datatype

[WenyXu]

Support to struct datatype

#14

[codecov]

Codecov Report

Attention: 258 lines in your changes are missing coverage. Please review.

Comparison is base (995e0f3) 79.35% compared to head (b4828e4) 76.42%.
Report is 6 commits behind head on main.

❗ Current head b4828e4 differs from pull request most recent head feb932c. Consider uploading reports for the commit feb932c to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #26      +/-   ##
==========================================
- Coverage   79.35%   76.42%   -2.93%     
==========================================
  Files          29       32       +3     
  Lines        2499     3211     +712     
==========================================
+ Hits         1983     2454     +471     
- Misses        516      757     +241     

Flag	Coverage Δ
rust	76.42% <75.19%> (-2.93%)	⬇️

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

Files	Coverage Δ
src/arrow_reader/column/binary.rs	88.88% <100.00%> (+1.38%)	⬆️
src/arrow_reader/column/boolean.rs	100.00% <100.00%> (ø)
src/arrow_reader/column/date.rs	92.30% <100.00%> (ø)
src/arrow_reader/column/float.rs	100.00% <100.00%> (ø)
src/arrow_reader/column/int.rs	100.00% <100.00%> (ø)
src/arrow_reader/column/present.rs	100.00% <100.00%> (ø)
src/arrow_reader/column/string.rs	97.36% <100.00%> (+2.13%)	⬆️
src/arrow_reader/column/timestamp.rs	90.00% <100.00%> (+0.81%)	⬆️
src/arrow_reader/column/tinyint.rs	100.00% <100.00%> (ø)
src/async_arrow_reader.rs	82.08% <100.00%> (+2.25%)	⬆️
... and 10 more

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[Jefffrey]

Looks good 👍

Lots of changes but we can probably focus on getting functionality in first before then optimizing/refactoring later