feat: awss3 DownloadFiles use PooledBufferedWriterReadFromProvider

[tomtwinkle]

DL速度安定化のためにBufferProviderを指定する。
サイズはPartSizeに合わせる。

DefaultDownloadPartSize=1024*1204*5
DefaultPartBodyMaxRetries=3
DefaultDownloadConcurrency=5

https://zenn.dev/ichigo_dev/articles/2ff2ae3ce02e2a5f15da

[codecov]

Codecov Report

Merging #254 (6d8f00a) into main (7d537c4) will increase coverage by 0.08%.
Report is 2 commits behind head on main.
The diff coverage is 100.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #254      +/-   ##
==========================================
+ Coverage   68.22%   68.31%   +0.08%     
==========================================
  Files          19       19              
  Lines        1067     1070       +3     
==========================================
+ Hits          728      731       +3     
  Misses        266      266              
  Partials       73       73              

Files Changed	Coverage Δ
aws/awss3/awss3.go	74.57% <100.00%> (+0.21%)	⬆️