chore: type for the Outputs removed and made it map[string]any to have better support in templates

[dadrus]

fix for #1487.

Before it usage of the dig template function resulted in an internal error due to a type conversation issue.

[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 4 lines in your changes missing coverage. Please review.

Project coverage is 89.59%. Comparing base (4475745) to head (05d4c29).
Report is 1 commits behind head on main.

Files	Patch %	Lines
...nal/handler/envoyextauth/grpcv3/request_context.go	0.00%	2 Missing ⚠️
internal/handler/requestcontext/request_context.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1594      +/-   ##
==========================================
- Coverage   89.63%   89.59%   -0.04%     
==========================================
  Files         272      271       -1     
  Lines        9012     9008       -4     
==========================================
- Hits         8078     8071       -7     
- Misses        696      697       +1     
- Partials      238      240       +2     

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