Automatic examples for OpenAPIGen

[barthorre]

Is your feature request related to a problem? Please describe.

When using zio-schema to define an input message for a POST endpoint, I don't want to have to define
example(s) for the OpenAPI swagger manually.

Describe the solution you'd like

I would like the OpenAPIGen to have an option to generate examples based on the default value of a zio-schema.

Describe alternatives you've considered

As an alternative I have added the default values of my zio-schema's as examples to the Endpoint definition.

Additional context

I am working with proto specs, which get translated through scalapb to zio-schema's.
Consider this example:

message Message {
  string id = 1;
  oneof data {
    Data1 one = 2;  
    Data2 two = 3;
  }
}

It would be really nice of I could generate 2 example requests on the swagger endpoint automatically, one for each entry in the enum.

The workaround defined above is using something like this

    case record: Schema.Record[_] =>
      record.fields.find(_.fieldName == "data").toList.flatMap { field =>
        field.schema match {
          case enum: Schema.Enum[_] => `enum`.cases.flatMap { cse =>
              cse.schema.defaultValue.toOption.flatMap {
                case a: Message.Data    => Some(cse.id -> Message.of("id", a))
              }
            }
          case _ => throw new RuntimeException("Expected enum")
        }
      }
    case _ => throw new RuntimeException("Expected record")
  }
  
  
val endpoint =  Endpoint(RoutePattern.POST / "message").in[Message].examplesIn(examples: _*).out[String]
  OpenAPIGen.fromEndpoints("API", "1.0.0", endpoint))

[jdegoes]

/bounty $250 for basic implementation that works off Schema and can handle any Schema but which does not generate meaningful information (e.g. strings are just alphanumeric, etc., regardless of field name).

[algora-pbc]

💎 $250 bounty • ZIO

Steps to solve:

1. Start working: Comment /attempt #3196 with your implementation plan
2. Submit work: Create a pull request including /claim #3196 in the PR body to claim the bounty
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