SNOW-1883649 wiremock integration and mappings for oauth

[sfc-gh-pmotacki]

Description

Please explain the changes you made here.

Checklist

• Format code according to the existing code style (run npm run lint:check -- CHANGED_FILES and fix problems in changed code)
• Create tests which fail without the change (if possible)
• Make all tests (unit and integration) pass (npm run test:unit and npm run test:integration)
• Extend the types in index.d.ts file (if necessary)
• Extend the README / documentation and ensure is properly displayed (if necessary)
• Provide JIRA issue id (if possible) or GitHub issue id in commit message

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.91%. Comparing base (9cae043) to head (1e46f63).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #996      +/-   ##
==========================================
+ Coverage   88.88%   88.91%   +0.03%     
==========================================
  Files          72       73       +1     
  Lines        7001     7020      +19     
==========================================
+ Hits         6223     6242      +19     
  Misses        778      778              

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