Generation: add overwriteable type names

[wizzardich]

Current Behaviour

Given the following spec:

components:
  messages:
    EventSuccess:
      payload:
        type: object
        properties:
          event_id:
            type: integer
            description: The id of the event
            x-go-name: EventID 

The produced output will have the generated type:

> asyncapi-codegen -i asyncapi.yml -g types -o gen.gen.go

// EventSuccessMessagePayload is a schema from the AsyncAPI specification required in messages
type EventSuccessMessagePayload struct {
	// Description: The id of the event
	EventId *int64 `json:"event_id"`
}

Desired Behaviour

The x-go-name directive is respected, the same way oapi-codegen does here

type EventSuccessMessagePayload struct {
	// Description: The id of the event
	EventID *int64 `json:"event_id"`
}

Notes

• Ok, I'm back with more XD
• This is similar to #162. It's handy to be able to overwrite the generated field names, for the consistency of the user's codebase.

[lerenn]

Hello @wizzardich ! Thanks for taking the time to open the issues !

I'm on vacation until next week, so I may have not a lot of time, but I'll review everything ASAP :)

[wizzardich]

It's a bit busy for me as well right now, but I'll try to get to it in coming weeks!