feat: provide controller result to PostProcessor functions

[Inkdpixels]

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This PR introduces the option that all @PostProcessor decorators can access the result of the controller method.

This is useful as one could validate the returned result against a swagger schema inside a processor function.

[IkerZamora]

This makes total sense. Why is it not merged yet? @thiagobustamante

[codecov[bot]]

Codecov Report

Merging #151 (262e676) into master (70a2716) will not change coverage. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #151   +/-   ##
=======================================
  Coverage   94.48%   94.48%           
=======================================
  Files          14       14           
  Lines        1070     1070           
  Branches      195      195           
=======================================
  Hits         1011     1011           
  Misses         59       59           

Impacted Files	Coverage Δ
src/server/model/metadata.ts	100.00% <ø> (ø)
src/server/model/server-types.ts	100.00% <ø> (ø)
src/decorators/services.ts	100.00% <100.00%> (ø)
src/server/service-invoker.ts	92.35% <100.00%> (ø)

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