Implement select with JSON form schema standard

[videni]

implement select with json form schema standard.

 "selectWidgetOptions": {
      "title": "Custom select widget with options",
      "type": "string",
      "enum": [
        "foo",
        "bar"
      ],
      "enumNames": [
        "Foo",
        "Bar"
      ]
    }

instead of

"select": {
      "id": "$root/properties/string/properties/select",
      "type": "string",
      "title": "下拉框组件",
      "description": "下拉框组件",
      "$componentType": "select",
      "$options": [
        {
          "label": "选项1",
          "value": "值1"
        },
        {
          "label": "选项2",
          "value": "值2"
        }
      ]
    },

For select with auto complete ability, seems there is no solution in JSON form schema document, but we can implement it with custom widget. just leave this to developer.