[vaadin-message] Allow adding components to message #10278
Description
Describe your motivation
When I am using MessageList to integrate AI assistant with my application, sometimes the response can have data attached which is better visualized with Chart, Grid or Html component for example. Hence it would be beneficial if vaadin-message, i.e. MessageListItem in Java would allow inlined component.
Describe the solution you'd like
I would assume the most straightforward approach would be to add a named slot for components / attachments to vaadin-message. In Java MessageListItem then should have method like add(Component component...).
Describe alternatives you've considered
No response
Additional context
No response