Add exponential backoff with jitter algorithm for retry package

[ghosx]

I think the default backoff algorithm should be modified and use the algorithm with jitter, so I contributed an implementation.

reference: http://www.awsarchitectureblog.com/2015/03/backoff.html

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (b913549) 36.85% compared to head (8503409) 36.89%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2786      +/-   ##
==========================================
+ Coverage   36.85%   36.89%   +0.03%     
==========================================
  Files         672      672              
  Lines       39799    39812      +13     
==========================================
+ Hits        14667    14687      +20     
+ Misses      23510    23505       -5     
+ Partials     1622     1620       -2     

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