guqing f21171de21 feat: add plugin development docs (#123) ...

### What this PR does?
添加插件开发文档

### Which issue(s) this PR fixes
Fixes #113

/area docs

```release-note
None
```

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..

extension-client.md

feat: add plugin development docs (#123)

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extension.md

feat: add plugin development docs (#123)

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reverseproxy.md

feat: add plugin development docs (#123)

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role-template.md

feat: add plugin development docs (#123)

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