fix: generate operation ID if not present, fixes #201

[danielgtaylor]

If an OpenAPI operation has no operation ID, then generate it using the method+path, converted to kebab casing. For example, GET /users/{user-id}/friends → get-users-user-id-friends. No attempt is made to infer what arguments might mean or whether something is a list vs get.

[codecov]

Codecov Report

Merging #213 (04a021c) into main (c47eb00) will increase coverage by 0.01%.
The diff coverage is 100.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #213      +/-   ##
==========================================
+ Coverage   75.76%   75.78%   +0.01%     
==========================================
  Files          26       26              
  Lines        3574     3576       +2     
==========================================
+ Hits         2708     2710       +2     
  Misses        666      666              
  Partials      200      200              

Files Changed	Coverage Δ
openapi/openapi.go	88.53% <100.00%> (+0.05%)	⬆️

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