Added number of rows read in CSV inference

[jorgecarleitao]

The return argument is now (Vec<Field>, usize), where the latter is the number of read rows used in the inference.

[codecov]

Codecov Report

Merging #765 (acba926) into main (a886e35) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #765      +/-   ##
==========================================
+ Coverage   71.01%   71.02%   +0.01%     
==========================================
  Files         315      315              
  Lines       16950    16950              
==========================================
+ Hits        12037    12039       +2     
+ Misses       4913     4911       -2     

Impacted Files	Coverage Δ
src/io/csv/read/infer_schema.rs	95.45% <100.00%> (ø)
src/io/csv/read_async/infer_schema.rs	79.16% <100.00%> (ø)
src/compute/arithmetics/time.rs	26.60% <0.00%> (+0.91%)	⬆️
src/io/parquet/read/nested_utils.rs	78.43% <0.00%> (+0.98%)	⬆️

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