telemetry(amazonq): adding a new metric amazonq_invokeLLM for agentic chat (#1027)

## Problem
- IDE has `amazonq_toolUseSuggested` metric emitted per tool execution
but this count will be high in the future.
- No latency metrics for tool execution.

## Solution
- `amazonq_invokeLLM` is emitted per LLM call in the agentic loop, this
emits the list of toolName's, list of toolId's and list of tool
execution latencies.
```
{
            "name": "amazonq_invokeLLM",
            "description": "This metric is emitted per LLM call in the agentic loop with or without tool execution.",
            "metadata": [
                {
                    "type": "credentialStartUrl",
                    "required": false
                },
                {
                    "type": "cwsprChatConversationId"
                },
                {
                    "type": "cwsprChatConversationType"
                },
                {
                    "type": "cwsprToolName"
                },
                {
                    "type": "cwsprToolUseId"
                },
                {
                    "type": "enabled",
                    "required": false
                },
                {
                    "type": "languageServerVersion",
                    "required": false
                },
                {
                    "type": "latency",
                    "required": false
                },
            ]
        },
   ```
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## License

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

Author: laileni-aws

telemetry/definitions/commonDefinitions.json

@@ -1307,12 +1307,12 @@
         {
             "name": "cwsprToolName",
             "type": "string",
-            "description": "Client side tool name (ex: fsWrite, executeBash)"
+            "description": "Client side tool/s name (ex: fsWrite, executeBash)"
         },
         {
             "name": "cwsprToolUseId",
             "type": "string",
-            "description": "The id for when a client side tool is used."
+            "description": "The id/s when a client side tool/s is used."
         },
         {
             "name": "databaseCredentials",
@@ -1807,6 +1807,11 @@
             "type": "string",
             "description": "The version of the language server"
         },
+        {
+            "name": "latency",
+            "type": "string",
+            "description": "latency/s from any operation or an execution like tool execution."
+        },
         {
             "name": "loadFileTime",
             "type": "int",
@@ -2806,6 +2811,40 @@
                 }
             ]
         },
+        {
+            "name": "amazonq_invokeLLM",
+            "description": "This metric is emitted per LLM call in the agentic loop with or without tool execution.",
+            "metadata": [
+                {
+                    "type": "credentialStartUrl",
+                    "required": false
+                },
+                {
+                    "type": "cwsprChatConversationId"
+                },
+                {
+                    "type": "cwsprChatConversationType"
+                },
+                {
+                    "type": "cwsprToolName"
+                },
+                {
+                    "type": "cwsprToolUseId"
+                },
+                {
+                    "type": "enabled",
+                    "required": false
+                },
+                {
+                    "type": "languageServerVersion",
+                    "required": false
+                },
+                {
+                    "type": "latency",
+                    "required": false
+                }
+            ]
+        },
         {
             "name": "amazonq_isAcceptedCodeChanges",
             "description": "User applied code changes generated for the task.",