feat: awss3.DownloadFiles parallels download

[tomtwinkle]

awss3.DownloadFiles parallels download

[codecov]

Codecov Report

Merging #252 (aa25d86) into main (e11a487) will decrease coverage by 31.78%.
The diff coverage is 58.33%.

❗ Current head aa25d86 differs from pull request most recent head f1dfa26. Consider uploading reports for the commit f1dfa26 to get more accurate results

Additional details and impacted files

@@             Coverage Diff              @@
##              main     #252       +/-   ##
============================================
- Coverage   100.00%   68.22%   -31.78%     
============================================
  Files            1       19       +18     
  Lines           40     1067     +1027     
============================================
+ Hits            40      728      +688     
- Misses           0      266      +266     
- Partials         0       73       +73     

Files Changed	Coverage Δ
aws/awss3/awss3.go	74.35% <58.33%> (ø)

... and 19 files with indirect coverage changes