inspector: convert event params to protocol without json

Event params object can be converted to inspector protocol directly.
This also enables binary data, like `Network.dataReceived`, to be sent
in the inspector protocol from JavaScript since JSON representation
does not support plain binary data.
PR-URL: #57027
Reviewed-By: Kohei Ueno <kohei.ueno119@gmail.com>

Author: legendecas

lib/inspector.js

@@ -24,6 +24,7 @@ if (!hasInspector)
 
 constEventEmitter=require('events');
 const{ queueMicrotask }=require('internal/process/task_queues');
+const{ kEmptyObject }=require('internal/util');
 const{
  isUint32,
  validateFunction,
@@ -189,12 +190,10 @@ function inspectorWaitForDebugger() {
 thrownewERR_INSPECTOR_NOT_ACTIVE();
 }
 
-functionbroadcastToFrontend(eventName,params){
+functionbroadcastToFrontend(eventName,params=kEmptyObject){
 validateString(eventName,'eventName');
-if(params){
-validateObject(params,'params');
-}
-emitProtocolEvent(eventName,JSONStringify(params??{}));
+validateObject(params,'params');
+emitProtocolEvent(eventName,params);
 }
 
 constNetwork={