Add configure of quantization for dynamic graph #48000
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1. Fix typo 2. Create new directory for unitests of quantization 3. Import quanter to paddle.quantization package 4. Refine docs
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…y to make the doc can be extracted from code 2. remvoe some __all__
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2. remove unused __all__
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PR types
New features
PR changes
APIs
Describe
Add configure of quantization for dynamic graph
原PR: #47530
和之前有什么不同
整个量化功能可以分为两部分：
本次调整，将量化功能和API放在合适的位置：
之前，
现在，
当前PR为本次调整的部分工作
当前PR包括以下架构图中的QuantConfig, QuanterFactory和部分quanter
关键概念
Quanter
对OP的输入或输出执行量化操作。
ObserverFactory & QuanterFactory
QauntConfig
对ObserverFactory & QuanterFactory实例进行管理，存储模型量化配置的所有信息。
关键类设计
在执行量化操作之前，用户首先要配置量化相关的信息，主要是指定每层的各个输入使用什么Observer或Quanter.
配置功能主要涉及三个类：QuantConfig，SingleLayerConfig，ObserverFactory/QuanterFactory。以上三个类分别存储整个模型、单层和单个Observer的配置信息。他们之间是组合关系，QuantConfig实例中包含若干SingleLayerConfig实例，SingleLayerConfig实例包含若干ObserverFactory/QuanterFactory实例。