feat: expose tokens in useTheme

[johnkim-det]

Adding tokens to useTheme hook so that any component can use the design tokens already being used by components with antd implementations -- specifically for ET-224 in this case.

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[determined-ci]

Hello! No changes detected to DesignKit for commit 7099924. Verify here

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.78%. Comparing base (6720f8a) to head (7099924).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #130      +/-   ##
==========================================
+ Coverage   82.76%   82.78%   +0.01%     
==========================================
  Files          49       49              
  Lines        6477     6482       +5     
  Branches      454      454              
==========================================
+ Hits         5361     5366       +5     
  Misses       1116     1116              

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