Explicitly set default values for fields of NetworkResource (facebook#54191)

Summary:
Pull Request resolved: facebook#54191

Explicitly set default values for fields of NetworkResource

changelog: [internal] internal

Reviewed By: cortinico

Differential Revision: D84954456

fbshipit-source-id: 27f48ca0c174045023da4d87429973b26a788103

Author: mdvacca

packages/react-native/ReactCommon/jsinspector-modern/NetworkIOAgent.h

@@ -40,10 +40,10 @@ struct ReadStreamParams {
 
 struct NetworkResource {
   bool success{};
-  std::optional<std::string> stream;
-  std::optional<uint32_t> httpStatusCode;
-  std::optional<std::string> netErrorName;
-  std::optional<Headers> headers;
+  std::optional<std::string> stream{};
+  std::optional<uint32_t> httpStatusCode{};
+  std::optional<std::string> netErrorName{};
+  std::optional<Headers> headers{};
   folly::dynamic toDynamic() const {
     auto dynamicResource = folly::dynamic::object("success", success);