feat: add built-in transformers

[Aziteee]

内置了一些转换器

默认情况下开启，在代码第一行加上 [!no transformer] 后，转换器就会被禁用

由于转换器功能新增了大量 css，这可能导致与一些主题自带的 css 冲突，所以增加了一个配置选项，使插件不带有样式。这也方便了主题适配插件。

此 PR 基于 #2

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