feat: add general latency metrics (#913)

## Problem
- Soooooooooo many teams have specific latency metric fields and many
are asking to add them for re-invent

## Solution
- De-dup a lot of them e.g. amazonqGenerateApproachLatency,
amazonqGenerateCodeResponseLatency, amazonqEndOfTheConversationLatency,
etc

## Other notes
- amazonq_approachInvoke would then have perfServerLatency instead of an
individual amazonqGenerateApproachLatency field
- amazonq_codeGenerationInvoke would then have perfServerLatency instead
of an individual amazonqGenerateCodeResponseLatency field
- amazonq_endChat would then have perfE2ELatency instead of an
individual amazonqEndOfTheConversationLatency field

- In the future we can re-use the perfClientLatency metric for tracking
the duration of different events that only happen in the client side
(e.g. how long the client latency takes in the amazon q chat flow)

Author: jpinkney-aws

telemetry/definitions/commonDefinitions.json

@@ -1145,7 +1145,7 @@
                 "remoteDesktop",
                 "ssh",
                 "scp",
-                "ssm", 
+                "ssm",
                 "remoteWorkspace"
             ],
             "description": "Ways to connect to an EC2 Instance"
@@ -1488,6 +1488,21 @@
             "type": "int",
             "description": "Number of generation paths modified"
         },
+        {
+            "name": "perfClientLatency",
+            "type": "double",
+            "description": "The time duration in milliseconds to process an action on the client side"
+        },
+        {
+            "name": "perfE2ELatency",
+            "type": "double",
+            "description": "The time duration in milliseconds to complete an end to end flow"
+        },
+        {
+            "name": "perfServerLatency",
+            "type": "double",
+            "description": "The time duration in milliseconds to finish a request to the server side"
+        },
         {
             "name": "platform",
             "type": "string",
@@ -7069,4 +7084,4 @@
             ]
         }
     ]
-}
+}