Generating map[string]Struct from OpenAPI spec "additionalProperties"

[alxsad]

Using spec

Template:
 properties:
   endpoints:
     additionalProperties:
       $ref: "#/components/schemas/Endpoint"
     type: object

should generate

type Template struct {
   Endpoints map[string]Endpoint `json:"endpoints"`
}

instead of

type Template struct {
   Endpoints interface{} `json:"endpoints"`
}