把node 节点支持rest json 格式

    然后访问：

    {{drupal_weixiaokj}}/node/5?_format=json

    1. id: entity.node
    2. plugin_id: 'entity:node'
    3. granularity: method
    4. configuration:
    5.   GET:
    6.     supported_formats:
    7.       - json
    8.     supported_auth:
    9.       - basic_auth
    10.       - cookie