Add out-of-box support for Sentinel OpenSergo data-source

[sczyh30]

Which Component

Sentinel, OpenSergo

Describe the solution you'd like

Sentinel v1.8.6 introduces the data-source module of OpenSergo fault-tolerance spec. We could add support for OpenSergo data-source in spring-cloud-starter-alibaba-sentinel module (perhaps in spring-cloud-alibaba-sentinel-datasource).

Sentinel 1.8.6 版本引入了 OpenSergo 数据源模块，从而支持通过 OpenSergo 流量防护与容错 spec CRD 来统一管控流量防护规则。SCA 里面 Sentinel 相关 starter 模块可以添加对该模块的快速接入支持，以便用户可以可以很方便地通过 OpenSergo 统一控制面来管控 SCA 的流量治理规则。

Additional context

OpenSergo 流量防护与容错 spec: https://github.com/opensergo/opensergo-specification/blob/main/specification/zh-Hans/fault-tolerance.md

[123liuziming]

Please assign it to me.

[steverao]

It sounds good!

[sczyh30]

一个简单的用户使用流程示例（仅做流程参考，名称、形式后续讨论）：

用户引入 SCA Sentinel starter 模块，按照以下配置即可快速开启 OpenSergo spec 支持，无需再改代码：

# 配置 OpenSergo 控制面 endpoint
spring.cloud.opensergo.endpoint=127.0.0.1:10246

spring.cloud.sentinel.datasource.opensergo.enabled-rules=flow,degrade,system

[123liuziming]

I‘ve submit a POC pr here https://github.com/alibaba/spring-cloud-alibaba/pull/3142

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