Replace model-router and model-mapper with Go implementation (#3317)

plugins/wasm-go/extensions/model-mapper/README_EN.md

@@ -0,0 +1,61 @@
+# Function Description
+The `model-mapper` plugin implements model parameter mapping functionality based on the LLM protocol.
+
+# Configuration Fields
+
+| Name                 | Type            | Requirement             | Default Value            | Description |
+| --- | --- | --- | --- | --- |
+| `modelKey`           | string          | Optional                | model                    | The position of the model parameter in the request body. |
+| `modelMapping`       | map of string   | Optional                | -                        | AI model mapping table, used to map the model name in the request to the model name supported by the service provider.<br/>1. Supports prefix matching. For example, use "gpt-3-*" to match all names starting with "gpt-3-";<br/>2. Supports using "*" as a key to configure a generic fallback mapping;<br/>3. If the target mapping name is an empty string "", it indicates keeping the original model name. |
+| `enableOnPathSuffix` | array of string | Optional                | ["/completions","/embeddings","/images/generations","/audio/speech","/fine_tuning/jobs","/moderations","/image-synthesis","/video-synthesis","/rerank","/messages"] | Only effective for requests with these specific path suffixes. |
+
+
+## Effect Description
+
+Configuration example:
+
+```yaml
+modelMapping:
+  'gpt-4-*': "qwen-max"
+  'gpt-4o': "qwen-vl-plus"
+  '*': "qwen-turbo"
+```
+
+After enabling, model parameters starting with `gpt-4-` will be replaced with `qwen-max`, `gpt-4o` will be replaced with `qwen-vl-plus`, and all other models will be replaced with `qwen-turbo`.
+
+For example, the original request is:
+
+```json
+{
+    "model": "gpt-4o",
+    "frequency_penalty": 0,
+    "max_tokens": 800,
+    "stream": false,
+    "messages": [{
+        "role": "user",
+        "content": "What is the github address of the main repository of the higress project"
+    }],
+    "presence_penalty": 0,
+    "temperature": 0.7,
+    "top_p": 0.95
+}
+```
+
+
+After processing by this plugin, the original LLM request body will be modified to:
+
+```json
+{
+    "model": "qwen-vl-plus",
+    "frequency_penalty": 0,
+    "max_tokens": 800,
+    "stream": false,
+    "messages": [{
+        "role": "user",
+        "content": "What is the github address of the main repository of the higress project"
+    }],
+    "presence_penalty": 0,
+    "temperature": 0.7,
+    "top_p": 0.95
+}
+```