s3_buffered_open switch buffered to False (#15)

[leavers]

[bbtfr]

测试挂了，还得对应的改一下测试

[codecov-commenter]

Codecov Report

Merging #62 (21d0b78) into main (d57aad1) will decrease coverage by 0.34%. The diff coverage is n/a.

@@            Coverage Diff             @@
##             main      #62      +/-   ##
==========================================
- Coverage   87.43%   87.09%   -0.35%     
==========================================
  Files          33       33              
  Lines        3678     3680       +2     
==========================================
- Hits         3216     3205      -11     
- Misses        462      475      +13     

Impacted Files	Coverage Δ
megfile/fs_path.py	100.00% <ø> (ø)
megfile/s3.py	92.22% <ø> (-0.26%)	:arrow_down:
megfile/lib/s3_prefetch_reader.py	87.20% <0.00%> (-3.88%)	:arrow_down:
megfile/cli.py	0.00% <0.00%> (ø)
megfile/interfaces.py	84.84% <0.00%> (+1.01%)	:arrow_up:

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[bbtfr]

代码没问题，但涉及到一些别的库需要的同步更新，暂时不合进去

[LoveEatCandy]

先关掉了，buffer=False 对读写 pickle 有影响，后面再想办法优化吧