add plugin: ai-transformer (#1035)

plugins/wasm-go/extensions/ai-transformer/README.md

@@ -0,0 +1,81 @@
+# 简介
+低代码开发插件，通过LLM对请求/响应的header以及body进行修改。
+
+# 配置说明
+| Name | Type | Requirement | Default | Description |
+| :- | :-  | :-  | :- | :- |
+| request.enable | bool | requried | - | 是否在request阶段开启转换 |
+| request.prompt | string | requried | - | request阶段转换使用的prompt |
+| response.enable | string | requried | - | 是否在response阶段开启转换 |
+| response.prompt | string | requried | - | response阶段转换使用的prompt |
+| provider.serviceName | string | requried | - | DNS类型的服务名，目前仅支持通义千问 |
+| provider.domain | string | requried | - | LLM服务域名 |
+| provider.apiKey | string | requried | - | 阿里云dashscope服务的API Key |
+
+# 配置示例
+```yaml
+request:
+    enable: false
+    prompt: "如果请求path是以/httpbin开头的，帮我去掉/httpbin前缀，其他的不要改。"
+response: 
+    enable: true
+    prompt: "帮我修改以下HTTP应答信息，要求：1. content-type修改为application/json；2. body由xml转化为json；3. 移除content-length。"
+provider: 
+    serviceName: qwen
+    domain: dashscope.aliyuncs.com
+    apiKey: xxxxxxxxxxxxx
+```
+
+访问原始的httbin的/xml接口，结果为：
+```
+<?xml version='1.0' encoding='us-ascii'?>
+
+<!--  A SAMPLE set of slides  -->
+
+<slideshow 
+    title="Sample Slide Show"
+    date="Date of publication"
+    author="Yours Truly"
+    >
+
+    <!-- TITLE SLIDE -->
+    <slide type="all">
+      <title>Wake up to WonderWidgets!</title>
+    </slide>
+
+    <!-- OVERVIEW -->
+    <slide type="all">
+        <title>Overview</title>
+        <item>Why <em>WonderWidgets</em> are great</item>
+        <item/>
+        <item>Who <em>buys</em> WonderWidgets</item>
+    </slide>
+
+</slideshow>
+```
+
+使用以上配置，通过网关访问httpbin的/xml接口，结果为：
+```
+{
+  "slideshow": {
+    "title": "Sample Slide Show",
+    "date": "Date of publication",
+    "author": "Yours Truly",
+    "slides": [
+      {
+        "type": "all",
+        "title": "Wake up to WonderWidgets!"
+      },
+      {
+        "type": "all",
+        "title": "Overview",
+        "items": [
+          "Why <em>WonderWidgets</em> are great",
+          "",
+          "Who <em>buys</em> WonderWidgets"
+        ]
+      }
+    ]
+  }
+}
+```