feat: oauth2 scopes for authn

[SoulPancake]

Description

What problem is being solved?

How is it being solved?

What changes are made to solve it?

References

Review Checklist

• I have clicked on "allow edits by maintainers".
• I have added documentation for new/changed functionality in this PR or in a PR to openfga.dev [Provide a link to any relevant PRs in the references section above]
• The correct base branch is being used, if not main
• I have added tests to validate that the change in functionality is working as expected

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 69.91%. Comparing base (590a3f2) to head (ad6a453).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #276      +/-   ##
==========================================
+ Coverage   69.85%   69.91%   +0.06%     
==========================================
  Files         140      140              
  Lines       10748    10764      +16     
==========================================
+ Hits         7508     7526      +18     
+ Misses       3240     3238       -2     

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