Improved performance in cast Primitive to Binary/String (2x)

[sundy-li]

Reuse the temp bytes buffer.

cast int32 to binary 512                                                                             
		time:   [10.650 us 10.761 us 10.885 us]
		change: [-47.175% -46.939% -46.649%] (p = 0.00 < 0.05)
		Performance has improved.

[codecov]

Codecov Report

Merging #646 (26f11b9) into main (a2d84d9) will decrease coverage by 0.00%.
The diff coverage is 82.60%.

@@            Coverage Diff             @@
##             main     #646      +/-   ##
==========================================
- Coverage   69.91%   69.91%   -0.01%     
==========================================
  Files         299      299              
  Lines       16628    16647      +19     
==========================================
+ Hits        11626    11639      +13     
- Misses       5002     5008       +6     

Impacted Files	Coverage Δ
src/compute/cast/primitive_to.rs	76.24% <82.60%> (+0.31%)	⬆️
src/util/lexical.rs	50.00% <0.00%> (-25.00%)	⬇️
src/bitmap/utils/slice_iterator.rs	91.04% <0.00%> (-1.50%)	⬇️
src/io/parquet/read/nested_utils.rs	77.45% <0.00%> (-0.99%)	⬇️
src/array/utf8/mutable.rs	85.77% <0.00%> (+0.39%)	⬆️
src/array/binary/mutable.rs	80.16% <0.00%> (+0.80%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update a2d84d9...26f11b9. Read the comment docs.

[jorgecarleitao]

Thanks @sundy-li ! Great idea!