Retry for IO read error

[xinaxu]

Offers simple retry strategy for IO read error.

   Retry Strategy
   --client-retry-backoff value      The constant delay backoff for retrying IO read errors (default: 1s)
   --client-retry-backoff-exp value  The exponential delay backoff for retrying IO read errors (default: 1.0)
   --client-retry-delay value        The initial delay before retrying IO read errors (default: 1s)
   --client-retry-max value          Max number of retries for IO read errors (default: 10)

resolves #327

[codecov]

Codecov Report

Patch coverage: 70.33% and project coverage change: +0.04% 🎉

Comparison is base (3baaef8) 73.78% compared to head (6344bb7) 73.82%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #332      +/-   ##
==========================================
+ Coverage   73.78%   73.82%   +0.04%     
==========================================
  Files         136      136              
  Lines        8555     8665     +110     
==========================================
+ Hits         6312     6397      +85     
- Misses       1577     1594      +17     
- Partials      666      674       +8     

Files Changed	Coverage Δ
docs/swagger/docs.go	100.00% <ø> (ø)
handler/storage/update.go	72.50% <0.00%> (-8.06%)	⬇️
storagesystem/rclone.go	78.85% <64.61%> (-6.44%)	⬇️
cmd/download.go	92.20% <100.00%> (+0.10%)	⬆️
cmd/storage/create.go	87.14% <100.00%> (+1.42%)	⬆️
cmd/storage/update.go	78.57% <100.00%> (+2.67%)	⬆️
model/basetypes.go	69.94% <100.00%> (+5.96%)	⬆️

... and 2 files with indirect coverage changes

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