Test host && make combined object definition can based on interface{} && add one more tips

[extrame]

Describe the PR

1. test host definition
2. give more information if param type is wrong
3. make combined object definition can defined based on interface{} like:
   " @success 200 {object} {success=bool}"

Relation issue
none

Additional context
none

[codecov]

Codecov Report

Merging #1261 (66b6f9e) into master (bd21bb0) will decrease coverage by 0.29%.
The diff coverage is 20.00%.

@@            Coverage Diff             @@
##           master    #1261      +/-   ##
==========================================
- Coverage   94.99%   94.69%   -0.30%     
==========================================
  Files          14       14              
  Lines        2618     2622       +4     
==========================================
- Hits         2487     2483       -4     
- Misses         72       76       +4     
- Partials       59       63       +4     

Impacted Files	Coverage Δ
parser.go	93.37% <0.00%> (-0.23%)	⬇️
operation.go	96.38% <33.33%> (-0.28%)	⬇️
generics.go	91.04% <0.00%> (-2.99%)	⬇️
packages.go	87.30% <0.00%> (-1.06%)	⬇️

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[ubogdan]

@extrame We expect all the contributions to be based on an open issue and to discuss the directions, so the developer's work wont is in vain.
I want to remind you that OpenApi Documentation (swagger) is about documenting types, not values.

You are documenting the response value for HTTP 200 OK if I understand well.