Context.Json should not unwrap response

[aldas]

Context.Json should not unwrap response and just wrap Response so other middlewares can use their own "wrapping" Responses and see the status code.

I found this during #2895 when to tried to create middleware that wraps existing response to own and status code setting did not work anymore with Context.JSON (always sends 200 to client).

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.18%. Comparing base (b12f646) to head (b593bc3).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2964      +/-   ##
==========================================
+ Coverage   93.08%   93.18%   +0.10%     
==========================================
  Files          43       43              
  Lines        4510     4507       -3     
==========================================
+ Hits         4198     4200       +2     
+ Misses        195      189       -6     
- Partials      117      118       +1     

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