Server Variable Object are not implemented

[Herrick19]

Hi,

OpenAPI support a feature called "Server Variable Object" that allows to define variable in Servers as you can see here:
http://spec.openapis.org/oas/v3.0.3#server-variable-object

Stoplight has not implemented this section and it's causing issues as:
1- No way to configure this using the Forms, you need to go in "Code" to deal with this.
2- In Preview/Try It, nothing works as there is no way to change the variables
3- Generated documentation is not usuable as the variables are not parsed.

Here is an example of the yaml definition:
`---
servers:

• url: https://{sInfrastructureenvironmenttypeDescription}.api.appcluster01.{sInfrastructureregionCode}.ezmax.com/rest
  description: The server endpoint where to send your API requests.
  variables:
  sInfrastructureenvironmenttypeDescription:
  enum:
  - prod
  - stg
  - qa
  - dev
  default: prod
  description: The environment on on which to call the API. Should always be "prod"
  unless instructed otherwise by support.
  sInfrastructureregionCode:
  enum:
  - ca-central-1
  - local
  default: ca-central-1
  description: The region where your services are hosted.
  `

It would be useful if the feature could be implemented.

Thanks in advance