feat(gen): avoid response empty structs when possible

[shadowspore]

[codecov[bot]]

Codecov Report

Merging #386 (76da7e7) into main (258d0ab) will decrease coverage by 2.34%. The diff coverage is 83.33%.

:exclamation: Current head 76da7e7 differs from pull request most recent head b7a6046. Consider uploading reports for the commit b7a6046 to get more accurate results

@@            Coverage Diff             @@
##             main     #386      +/-   ##
==========================================
- Coverage   72.54%   70.19%   -2.35%     
==========================================
  Files         154      145       -9     
  Lines       11201    10640     -561     
==========================================
- Hits         8126     7469     -657     
- Misses       2649     2722      +73     
- Partials      426      449      +23     

Impacted Files	Coverage Δ
gen/ir/operation.go	62.24% <83.33%> (+0.61%)	:arrow_up:
schema.go	57.21% <0.00%> (-28.92%)	:arrow_down:
gen/router.go	71.42% <0.00%> (-22.81%)	:arrow_down:
openapi/parser/resolve.go	65.19% <0.00%> (-19.42%)	:arrow_down:
openapi/parser/parse_mediatype.go	81.55% <0.00%> (-17.60%)	:arrow_down:
jsonschema/errors.go	70.58% <0.00%> (-16.37%)	:arrow_down:
openapi/parser/parse_example.go	85.00% <0.00%> (-15.00%)	:arrow_down:
openapi/parser/parser.go	88.20% <0.00%> (-11.80%)	:arrow_down:
gen/errors.go	52.63% <0.00%> (-10.53%)	:arrow_down:
jsonschema/num.go	75.00% <0.00%> (-10.37%)	:arrow_down:
... and 74 more

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