feat: improve `$` helpers and error object

[pi0]

• Use destr for $ helpers ($get, $post, ...) for smart and secure (prototype pollution preventation) decode json reponses but fall-back in case of response is not json
• Add error.statusCode and err.response.data? for better DX
• Allow chaining error using onError hook for better control

TODO

• [x] Tests
• [x] Docs

Credits

• @kevinmarrec and @benjamincanac for reporting use cases
• @Atinux for initial idea

[codecov-commenter]

Codecov Report

Merging #113 into dev will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev     #113   +/-   ##
=======================================
  Coverage   91.22%   91.22%           
=======================================
  Files           1        1           
  Lines          57       57           
  Branches       30       30           
=======================================
  Hits           52       52           
  Misses          5        5           

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[pi0]

https://github.com/nuxt/http/releases/tag/v0.5.4