Add fsspec storage plugin

[shicheng0829]

Fixes #102

[codecov[bot]]

Codecov Report

Merging #114 (32358df) into main (7fd1ece) will decrease coverage by 6.10%. The diff coverage is 26.78%.

:exclamation: Current head 32358df differs from pull request most recent head f282366. Consider uploading reports for the commit f282366 to get more accurate results

@@            Coverage Diff             @@
##             main     #114      +/-   ##
==========================================
- Coverage   91.82%   85.71%   -6.11%     
==========================================
  Files          31       32       +1     
  Lines        2557     2612      +55     
==========================================
- Hits         2348     2239     -109     
- Misses        209      373     +164     

Impacted Files	Coverage Δ
torchsnapshot/storage_plugins/gcs.py	0.00% <ø> (-78.90%)	:arrow_down:
torchsnapshot/storage_plugin.py	44.73% <25.00%> (-23.84%)	:arrow_down:
torchsnapshot/storage_plugins/fsspec.py	26.92% <26.92%> (ø)
torchsnapshot/storage_plugins/s3.py	26.82% <0.00%> (-63.42%)	:arrow_down:
torchsnapshot/memoryview_stream.py	63.33% <0.00%> (-6.67%)	:arrow_down:

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[shicheng0829]

Fix some bugs and add more unit test. Please review the pr again if you have free time. Thank you!