Attribute broadcasts to their sender via message metadata

[jeremy46231]

Adds .metadata.event_payload.source_user_id to the /pro channel and /pro here messages, which post with the caller's name and avatar via chat:write.customize.

@@ -26,6 +26,10 @@ export default {
         text,
         username: u.profile.display_name || u.real_name || u.name,
         icon_url: u.profile.image_192,
+        metadata: {
+          event_type: "pro_here_message",
+          event_payload: { source_user_id: cmd.user_id },
+        },
         blocks: [{ type: "section", text: { type: "mrkdwn", text } }],
       };

Same change in channel.js with event_type: "pro_channel_message".

This is for ShowRealUser in Taut (it renders bot-sent messages as the user that actually sent them), and it's also useful for this metadata to exist for other uses. The same change is already merged in at-channel and others.

[3kh0]

#sponsored by taut