[Toast] Toast config support 'theme'

[pointhalo]

Which Component Need Enhancement 期望新增功能的组件

• Toast

What does the proposed API look like 期望支持的API

• 期望一次性全局配置 toast theme属性，目前toast config 仅支持以下属性，未支持theme配置

Feature Description 功能描述

Additional information 补充说明

[pointhalo]