[Bug]: User interface views need sender returned in new "process_message_before_send" hook

[radman-x]

Describe the bug

User interfaces for chat-like experience need to know what the sender is in the new "process_message_before_send" hook (PR #1783). Having the recipient is good but not enough. This is a very simple fix -- just pass "self" as the sender in ConversableAgent._process_message_before_send().

Steps to reproduce

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Expected Behavior

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Screenshots and logs

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Additional Information

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[sonichi]

Thanks. Adding sender in the hook is good. Would you like to make a PR?

[RohitRathore1]

Thanks. Adding sender in the hook is good. Would you like to make a PR?

@sonichi I would like to open the PR against this issue. Thanks!