fix send message extras bug

Author: huangminlinux

example/ios/JMessageDemo/JMessageDemo.entitlements

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>aps-environment</key>
+	<string>development</string>
+</dict>
+</plist>

ios/RCTJMessageModule/RCTJMessageModule.m

@@ -1972,6 +1972,13 @@ - (JMSGOptionalContent *)convertDicToJMSGOptionalContent:(NSDictionary *)dic {
 
     self.SendMsgCallbackDic[message.msgId] = @[successCallback,failCallback];
 
+    if (param[@"extras"] && [param[@"extras"] isKindOfClass: [NSDictionary class]]) {
+      NSDictionary *extras = param[@"extras"];
+      for (NSString *key in extras.allKeys) {
+        [message.content addStringExtra:extras[key] forKey:key];
+      }
+    }
+    
     if (messageSendingOptions) {
       [conversation sendMessage:message optionalContent:messageSendingOptions];
     } else {