feat: add plugin/read. (#14445)

return more information for a specific plugin.

codex-rs/app-server-protocol/schema/json/ClientRequest.json

@@ -1143,6 +1143,21 @@
       },
       "type": "object"
     },
+    "PluginReadParams": {
+      "properties": {
+        "marketplacePath": {
+          "$ref": "#/definitions/AbsolutePathBuf"
+        },
+        "pluginName": {
+          "type": "string"
+        }
+      },
+      "required": [
+        "marketplacePath",
+        "pluginName"
+      ],
+      "type": "object"
+    },
     "PluginUninstallParams": {
       "properties": {
         "pluginId": {
@@ -3559,6 +3574,30 @@
       "title": "Plugin/listRequest",
       "type": "object"
     },
+    {
+      "properties": {
+        "id": {
+          "$ref": "#/definitions/RequestId"
+        },
+        "method": {
+          "enum": [
+            "plugin/read"
+          ],
+          "title": "Plugin/readRequestMethod",
+          "type": "string"
+        },
+        "params": {
+          "$ref": "#/definitions/PluginReadParams"
+        }
+      },
+      "required": [
+        "id",
+        "method",
+        "params"
+      ],
+      "title": "Plugin/readRequest",
+      "type": "object"
+    },
     {
       "properties": {
         "id": {