controllers/token: Replace BytesRequest with Json extractor

[Turbo87]

The only reason for using BytesRequest is to provide a custom error message, but I question whether that is actually that useful here...

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.12%. Comparing base (4b95c44) to head (b822c04).
Report is 8 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #9564   +/-   ##
=======================================
  Coverage   89.11%   89.12%           
=======================================
  Files         285      285           
  Lines       28923    28925    +2     
=======================================
+ Hits        25775    25778    +3     
+ Misses       3148     3147    -1     

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