Add exponential backoff before retrying

[int128]

This will add the exponential backoff before retrying connection.

[codecov-io]

Codecov Report

Merging #25 into master will decrease coverage by 0.19%.
The diff coverage is 88.88%.

@@            Coverage Diff            @@
##           master      #25     +/-   ##
=========================================
- Coverage   86.36%   86.17%   -0.2%     
=========================================
  Files           1        1             
  Lines          88       94      +6     
=========================================
+ Hits           76       81      +5     
- Misses          7        8      +1     
  Partials        5        5

Impacted Files	Coverage Δ
pkg/usecases/authproxy/auth_proxy.go	86.17% <88.88%> (-0.2%)	⬇️

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