Enum and OpenAPIGenerator

### Question

Hello, how to build enum Int raw value but named cases like:
```swift
enum SizeValue: Int {
case mini = 10
case mid = 30
case max = 100
}
```
with OpenAPI 3.x and swift-openapi-generator ;)
Thx for answer :)

The issue names no files or tests. Start by examining how an OpenAPI 3.x document represents enums and how swift-openapi-generator maps them to Swift enums with Int raw values; done means documenting or implementing support for named cases with raw values 10, 30, and 100.

Written by the indexing model from the issue text.