Create environments from OpenAPI server URLs

When importing from OpenAPI, it should be possible to create an environment for each of the included server URLs.

# Example server URLs that might be within a spec
servers:
  - url: https://api.example.com/v1
    description: Production server (uses live data)
  - url: https://sandbox-api.example.com:8443/v1
    description: Sandbox server (uses test data)