Add documentation for the new Agent feature and update sidebar positions for Metrics and API categories. Adjust code examples in various API documentation to reflect correct paths and improve clarity. Enhance the Agent class with an equals and hash code method for better functionality.

docs/docs/agent.md

@@ -0,0 +1,13 @@
+---
+sidebar_position: 4
+
+title: Agent
+---
+
+import CodeEmbed from '@site/src/components/CodeEmbed';
+
+# Agent
+
+:::warning[Note]
+This is work in progress
+:::