Log the execution time of each plugin. This allows for identification…

… and optimization of plugins taking the longest time.

PiperOrigin-RevId: 666334401
Change-Id: I7c922ed89b1463cdf3268bd77ac37a55e5dd74eb

plugin/src/main/java/com/google/tsunami/plugin/PluginExecutorImpl.java

@@ -70,6 +70,10 @@ private <T> PluginExecutionResult<T> buildSucceededResult(
     if (executionStopwatch.isRunning()) {
       executionStopwatch.stop();
     }
+    logger.atInfo().log(
+        "%s plugin execution finished in %d (ms)",
+        executorConfig.matchedPlugin().pluginDefinition().pluginInfo().name(),
+        executionStopwatch.elapsed().toMillis());
     return PluginExecutionResult.<T>builder()
         .setExecutionStatus(ExecutionStatus.SUCCEEDED)
         .setResultData(resultData)