Add support for errors.Unwrap() in SetException

[ribice]

Add support for handling errors using errors.Unwrap() in SetException.

Add ParentID, ExceptionID and Source to Exception.

Related issue: #693

RFC

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 97.05882% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 82.06%. Comparing base (08cdc59) to head (cc8fda7).

Files	Patch %	Lines
interfaces.go	97.05%	0 Missing and 1 partial :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #792      +/-   ##
==========================================
+ Coverage   81.97%   82.06%   +0.08%     
==========================================
  Files          49       49              
  Lines        4848     4872      +24     
==========================================
+ Hits         3974     3998      +24     
  Misses        732      732              
  Partials      142      142              

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