Feature: The SDK needs to be able to send messages that are only sent when the recipient is online.

[FGadvancer]

Checklist

• [X] I've searched for similar issues and couldn't find anything matching
• [X] I've discussed this feature request in the OpenIMSDK Slack and got positive feedback

Is this feature request related to a problem?

❎ No

Problem Description

The SDK needs to be able to send messages that are only sent when the recipient is online.

Solution Description

Add a parameter to the message sending function to control whether the message should be received only by online users.

Benefits

The IM message notification capability is more powerful, allowing customization of various signaling messages and more.

Potential Drawbacks

No response

Additional Information

No response