[BUG] [Elm] Uuid import and encoding missing

Created by: andys8

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• What's the version of OpenAPI Generator used?
• Have you search for related issues/PRs?
• What's the actual output vs expected output?
• [Optional] Bounty to sponsor the fix (example)

Description

If a path variable is of type Uuid, the import and the encoding is missing.

Output (without comment):

module Request.UserController exposing (get)

import Data.User as User exposing (User)
import Dict
import Http
import Json.Decode as Decode
import Url.Builder as Url


get :
    { onSend : Result Http.Error User -> msg
    , basePath : String
    , userId : Uuid
    }
    -> Cmd msg
get params =
    Http.request
        { method = "GET"
        , headers = []
        , url =
            Url.crossOrigin params.basePath
                [ "users", params.userId ]
                []
        , body = Http.emptyBody
        , expect = Http.expectJson params.onSend User.decoder
        , timeout = Just 30000
        , tracker = Nothing
        }

openapi-generator version

v4.0.0-beta2

OpenAPI declaration file content or url

    "/users/{userId}": {
      "get": {
        "tags": ["user-controller"],
        "summary": "get",
        "operationId": "get",
        "parameters": [
          {
            "name": "userId",
            "in": "path",
            "description": "userId",
            "required": true,
            "type": "string",
            "format": "uuid"
          }
        ],
        "responses": {
          "200": {
            "description": "OK",
            "schema": { "$ref": "#/definitions/User" }
          },
          "401": { "description": "Unauthorized" },
          "403": { "description": "Forbidden" },
          "404": { "description": "Not Found" }
        },
        "deprecated": false
      }
    }

Command line used for generation

docker run --rm -v /server-sdk:/local openapitools/openapi-generator-cli:v4.0.0-beta2 generate -i /local/swagger.json -o /local/sdk/elm -g elm --invoker-package abc --additional-properties elmEnableCustomBasePaths=true

Steps to reproduce

Build and look into output in Request files.

Related issues/PRs

This PR introduced UUIDs. https://github.com/OpenAPITools/openapi-generator/pull/1516

Suggest a fix

• add import
• uuid to string with prm

This is what the output should look like (without comment)

module Request.UserController exposing (get)

-- CHANGED: Uuid import added manually

import Data.User as User exposing (User)
import Dict
import Http
import Json.Decode as Decode
import Url.Builder as Url
import Uuid exposing (Uuid)


get :
    { onSend : Result Http.Error User -> msg
    , basePath : String
    , userId : Uuid
    }
    -> Cmd msg
get params =
    Http.request
        { method = "GET"
        , headers = []
        , url =
            Url.crossOrigin params.basePath
                [ "users"
                , -- CHANGED: UUID.toString added manually
                  Uuid.toString params.userId
                ]
                []
        , body = Http.emptyBody
        , expect = Http.expectJson params.onSend User.decoder
        , timeout = Just 30000
        , tracker = Nothing
        }