adding llmobs plugin and tests

Author: crysmags

packages/datadog-plugin-mcp-client/src/index.js

@@ -1,13 +1,24 @@
 'use strict'
 
+const mcpClientLLMObsPlugins = require('../../dd-trace/src/llmobs/plugins/mcp-client')
 const CompositePlugin = require('../../dd-trace/src/plugins/composite')
 const clientPlugin = require('./client')
 
+const plugins = {}
+
+// ordering here is important - the llm observability plugin must come first
+// so that we can add annotations associated with the span before it finishes.
+// however, because the tracing plugin uses `bindStart` vs the llmobs' `start`,
+// the span is guaranteed to be created in the tracing plugin before the llmobs one is called
+for (const Plugin of mcpClientLLMObsPlugins) {
+  plugins[Plugin.id] = Plugin
+}
+
+Object.assign(plugins, clientPlugin)
+
 class McpClientPlugin extends CompositePlugin {
   static id = 'mcp-client'
-  static plugins = {
-    ...clientPlugin,
-  }
+  static plugins = plugins
 }
 
 module.exports = McpClientPlugin