如何实现限流熔断降级权限的订阅

支持远程配置中心和本地规则文件的读取逻辑，即优先读取远程配置，如果不存在或者规则错误，则读取本地规则文件。动态实现远程配置中心对于规则的热刷新

支持如下开关开启该动能，默认是关闭的

# 启动和关闭Sentinel限流降级熔断权限等原生功能的数据来源扩展。缺失则默认为false
spring.application.strategy.sentinel.datasource.enabled=true

流控规则

增加服务discovery-guide-service-b的规则，Group为discovery-guide-group，Data Id为discovery-guide-service-b-sentinel-flow，规则内容如下

[
    {
        "resource": "sentinel-resource",
        "limitApp": "default",
        "grade": 1,
        "count": 1,
        "strategy": 0,
        "refResource": null,
        "controlBehavior": 0,
        "warmUpPeriodSec": 10,
        "maxQueueingTimeMs": 500,
        "clusterMode": false,
        "clusterConfig": null
    }
]

降级规则

增加服务discovery-guide-service-b的规则，Group为discovery-guide-group，Data Id为discovery-guide-service-b-sentinel-degrade，规则内容如下

[
    {
        "resource": "sentinel-resource",
        "limitApp": "default",
        "count": 2,
        "timeWindow": 10,
        "grade": 0,
        "passCount": 0
    }
]

授权规则

增加服务discovery-guide-service-b的规则，Group为discovery-guide-group，Data Id为discovery-guide-service-b-sentinel-authority，规则内容如下

[
    {
        "resource": "sentinel-resource",
        "limitApp": "discovery-guide-service-a",
        "strategy": 0
    }
]

系统规则

增加服务discovery-guide-service-b的规则，Group为discovery-guide-group，Data Id为discovery-guide-service-b-sentinel-system，规则内容如下

[
    {
        "resource": null,
        "limitApp": null,
        "highestSystemLoad": -1.0,
        "highestCpuUsage": -1.0,
        "qps": 200.0,
        "avgRt": -1,
        "maxThread": -1
    }
]

热点参数流控规则

增加服务discovery-guide-service-b的规则，Group为discovery-guide-group，Data Id为discovery-guide-service-b-sentinel-param-flow，规则内容如下

[
    {
        "resource": "sentinel-resource",
        "limitApp": "default",
        "grade": 1,
        "paramIdx": 0,
        "count": 1,
        "controlBehavior": 0,
        "maxQueueingTimeMs": 0,
        "burstCount": 0,
        "durationInSec": 1,
        "paramFlowItemList": [],
        "clusterMode": false
    }
]

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