Add reader for S3

[gauteh]

The performance of this reader is probably going to depend on:

• batching S3 requests
• how the index is created (how does h5py do it?)
• how the index is stored along with the data

Making the requests async, and decompression sync is probably the best strategy when that time comes.

Benchmark idea:

• Set up Thredds and Minio in docker serving the file.

[codecov-commenter]

Codecov Report

Merging #26 (876cdd2) into main (0e63714) will decrease coverage by 0.27%.
The diff coverage is 0.00%.

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@@            Coverage Diff             @@
##             main      #26      +/-   ##
==========================================
- Coverage   57.00%   56.73%   -0.27%     
==========================================
  Files          21       22       +1     
  Lines        1056     1061       +5     
==========================================
  Hits          602      602              
- Misses        454      459       +5     

Files Changed	Coverage Δ
src/reader/s3.rs	0.00% <0.00%> (ø)