feat: store raw and decoded token under artifacts

[cilindrox]

Use request.auth.artifacts to store a copy of the raw token and decoded payload.

Breaking Changes

request.auth.artifacts is now an object containing the raw token and decoded token fields instead of a string.

Migration Checklist

Artifacts are populated using the decoded (unvalidated) and raw token objects for easy access on the validation callback or any authentication-related actions.

Checklist:

• Look for request.auth.artifacts in your codebase and replace it with request.auth.artifacts.token

Closes #224 and #284

[codecov[bot]]

Codecov Report

Merging #341 into master will not change coverage. The diff coverage is 100%.

@@          Coverage Diff          @@
##           master   #341   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           2      2           
  Lines         133    133           
=====================================
  Hits          133    133

Impacted Files	Coverage Δ
lib/index.js	100% <100%> (ø)	:arrow_up:

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[cilindrox]

@nelsonic would appreciate your review :)

[cilindrox]

Replaced via #342