Perform exponential backoff with jitter when retrying requests

[terror]

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 26 lines in your changes missing coverage. Please review.

Project coverage is 85.91%. Comparing base (638b305) to head (d1c45cd).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/retry.rs	0.00%	26 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #632      +/-   ##
==========================================
- Coverage   86.21%   85.91%   -0.30%     
==========================================
  Files          45       45              
  Lines        6425     6447      +22     
==========================================
  Hits         5539     5539              
- Misses        886      908      +22     

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