carla map import and export records

1. Put the carla format map file into import| and configure the json file;

2. Execute make import to generate a map used by the source code;

3. Execute make package ARGS="--packages=Package1,Package2" to generate the map function package

（Create distribution packages for assets - CARLA Simulator）

4. Put the generated map package into the release version of carla, in the import folder, execute ./ImportAssets.sh

Note: a> Package1 and Package2 are the names of the imported map packages under Map Import, see the screenshot below

b>The Package_01.json configuration format is as follows:

{
  "maps": [    
	{
      "name": "test4", 
      "source": "./test4/test4.fbx",
      "use_carla_materials": false,
      "xodr": "./test4/test4.xodr"
    },
    {
      "name": "road_test", 
      "source": "./road_test/road_test.fbx",
      "use_carla_materials": false,
      "xodr": "./road_test/road_test.xodr"
    },
    {
      "name": "test", 
      "source": "./test/test.fbx",
      "use_carla_materials": false,
      "xodr": "./test/test.xodr"
    },
    {
      "name": "map2", 
      "source": "./map2/map2.fbx",
      "use_carla_materials": false,
      "xodr": "./map2/map2.xodr"
    },
    {
      "name": "map3", 
      "source": "./map3/map3.fbx",
      "use_carla_materials": false,
      "xodr": "./map3/map3.xodr"
    }
  ],
  "props": [
  ]
}

c>Generated file path: carla/dist/