动态规则源推模式

## Issue Description

看wiki文档上面说实现推模式的数据源最简单的方式是继承 AbstractDataSource 抽象类，那么是不是就不用实现DynamicRulePublisher 和 DynamicRuleProvider 接口来实现应用维度的规则推送和拉取了呢

### Describe what happened (or what feature you want)

### Describe what you expected to happen

### How to reproduce it (as minimally and precisely as possible)

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### Tell us your environment

### Anything else we need to know?

Start with the wiki guidance on implementing push-mode data sources and compare it with AbstractDataSource, DynamicRulePublisher, and DynamicRuleProvider. Determine whether the interfaces are still required for application-level rule publishing and pulling; done means the documentation clearly explains the relationship and expected implementation path.

Written by the indexing model from the issue text.