feat(gen): initial webhook support

[tdakkota]

For #592.

[codecov]

Codecov Report

Base: 73.87% // Head: 73.77% // Decreases project coverage by -0.09% ⚠️

Coverage data is based on head (7fdceaf) compared to base (bef1a77).
Patch coverage: 69.36% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #622      +/-   ##
==========================================
- Coverage   73.87%   73.77%   -0.10%     
==========================================
  Files         169      169              
  Lines       11547    11698     +151     
==========================================
+ Hits         8530     8630     +100     
- Misses       2582     2622      +40     
- Partials      435      446      +11     

Impacted Files	Coverage Δ
otelogen/tracer.go	50.00% <0.00%> (-50.00%)	⬇️
gen/generator.go	57.05% <51.85%> (-10.32%)	⬇️
gen/router.go	86.95% <78.04%> (-7.17%)	⬇️
gen/gen_operation.go	85.71% <100.00%> (+0.52%)	⬆️
gen/ir/operation.go	79.16% <100.00%> (+6.19%)	⬆️
gen/templates.go	82.73% <100.00%> (+0.63%)	⬆️
gen/write.go	88.73% <100.00%> (+0.32%)	⬆️
openapi/parser/parse_webhook.go	100.00% <100.00%> (ø)
... and 1 more

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