feat: Support custom claims in AccessToken - OKTA-326437

[denysoblohin-okta]

Changes:

• Add claims object to accessToken

This will allow retrieving custom claims from access token.

Resolves: #458
Internal ref: https://oktainc.atlassian.net/browse/OKTA-326437

[oleksandrpravosudko-okta]

looks good - it appears that CHANGELOG has to be updated

[codecov-io]

Codecov Report

Merging #518 (d1ba2b8) into master (6fc87ce) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #518   +/-   ##
=======================================
  Coverage   92.60%   92.61%           
=======================================
  Files          37       37           
  Lines        2070     2071    +1     
  Branches      420      420           
=======================================
+ Hits         1917     1918    +1     
  Misses        153      153           

Impacted Files	Coverage Δ
lib/types/Token.ts	100.00% <ø> (ø)
lib/token.ts	96.38% <100.00%> (+<0.01%)	⬆️

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