fix: encode response content object returned from an exception handler.

[rafalkrupinski]

Description

When an handler raises an exception and exception handler returns a Response with a model (e.g. pydantic) object, encode that object with the app type_encoders.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.25%. Comparing base (2e4b820) to head (39606b8).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3585   +/-   ##
=======================================
  Coverage   98.25%   98.25%           
=======================================
  Files         328      328           
  Lines       14868    14870    +2     
  Branches     2366     2366           
=======================================
+ Hits        14609    14611    +2     
  Misses        117      117           
  Partials      142      142           

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[rafalkrupinski]

discussion: https://discord.com/channels/919193495116337154/1240949774631440394

[provinzkraut]

Thanks @rafalkrupinski! I've left one suggestion

[rafalkrupinski]

Thanks for merging! Can't wait for the release ;)