feat: set error cause if available

[arthurschreiber]

This pull request updates ConnectionError and RequestError with support for a new options argumenton their constructor. This parameter mirrors the options of Error base class and allows setting a cause.

I updated all the locations where ConnectionError or RequestError are constructed to set the cause if available.

[codecov]

Codecov Report

Attention: Patch coverage is 83.33333% with 1 line in your changes missing coverage. Please review.

Project coverage is 79.11%. Comparing base (03777a7) to head (dd628c1).
Report is 1 commits behind head on master.

Files	Patch %	Lines
src/request.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1649      +/-   ##
==========================================
+ Coverage   78.99%   79.11%   +0.12%     
==========================================
  Files          93       93              
  Lines        4879     4879              
  Branches      937      937              
==========================================
+ Hits         3854     3860       +6     
+ Misses        721      711      -10     
- Partials      304      308       +4     

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[github-actions]

🎉 This PR is included in version 18.5.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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