Add exit code and change name of Time metric

Author: adwsingh

mcp/mcp-cli-api/src/main/java/software/amazon/smithy/java/mcp/cli/CliMetrics.java

@@ -31,9 +31,14 @@ public void addTiming(String name, long time) {
         timings.put(name, time);
     }
 
+    public int exitCode(int exitCode) {
+        telemetryData.exitCode(exitCode);
+        return exitCode;
+    }
+
     @Override
     public void close() {
-        timings.put("Time", System.nanoTime() - startTime);
+        timings.put("ExecutionTime", System.nanoTime() - startTime);
         telemetryData
                 .counters(counters)
                 .timings(timings)

mcp/mcp-cli-api/src/main/java/software/amazon/smithy/java/mcp/cli/SmithyMcpCommand.java

@@ -43,16 +43,17 @@ public final Integer call() {
         telemetry.command(commandName)
                 .cliVersion(spec.version()[0]);
 
-        try (var metrics = new CliMetrics(TELEMETRY_PUBLISHER, telemetry)) {
+        var metrics = new CliMetrics(TELEMETRY_PUBLISHER, telemetry);
+        try (metrics) {
             var config = loadOrCreateConfig();
             execute(new ExecutionContext(config, RegistryUtils.getRegistry(registryToUse(config), config), metrics));
-            return 0;
+            return metrics.exitCode(0);
         } catch (IllegalArgumentException e) {
             System.out.println("Invalid input : [" + e.getMessage() + "]");
-            return 2;
+            return metrics.exitCode(2);
         } catch (Exception e) {
             e.printStackTrace(System.out);
-            return 1;
+            return metrics.exitCode(1);
         }
     }
 

mcp/mcp-cli-api/src/main/resources/META-INF/smithy/mcp-cli-api.smithy

@@ -44,6 +44,9 @@ structure TelemetryData {
     @default({})
     timings: Timings
 
+    @required
+    exitCode: Integer
+
     params: String
 }