Fixes issue with JSON renderer

[djschleen]

A previous contribution changed the default JSON renderer that wrote to STDOUT for chaining. A new output type called json-file will output a JSON file to the filesystem.

[codecov]

Codecov Report

Attention: Patch coverage is 35.29412% with 11 lines in your changes missing coverage. Please review.

Project coverage is 66.37%. Comparing base (692b3e4) to head (1320f51).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
renderers/jsonfile/jsonfile.go	0.00%	7 Missing ⚠️
renderers/json/json.go	40.00%	2 Missing and 1 partial ⚠️
cmd/root.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #281      +/-   ##
==========================================
+ Coverage   65.81%   66.37%   +0.55%     
==========================================
  Files          28       29       +1     
  Lines        1562     1579      +17     
==========================================
+ Hits         1028     1048      +20     
+ Misses        504      500       -4     
- Partials       30       31       +1     

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