Feature request: Support for custom elements (e.g., buttons) at the end of AI responses

[franklupo]

Is your feature request related to a problem? Please describe.
I want to be able to add custom elements at the end of each AI response in RadzenAIChat. Currently, there is no way to define a footer template for responses.

Describe the solution you'd like

• Introduce a ResponseFooterTemplate property or similar.
• This template would allow appending custom Blazor components or buttons to each response.
• Example: action buttons like 👍 / 👎, Download, or other developer-defined actions.
• Elements should be fully interactive and trigger Blazor events or callbacks.

Describe alternatives you've considered

• Wrapping the chat component and manually appending UI elements, which is cumbersome and not integrated.

Additional context

• Goal: make each AI response interactive with custom UI elements without modifying the core chat component.

<RadzenAIChat @ref="chat"
              Messages="@messages">
    <ResponseFooterTemplate Context="message">
        <button class="btn btn-sm btn-primary" @onclick="() => OnThumbsUp(message)">👍</button>
        <button class="btn btn-sm btn-secondary ml-2" @onclick="() => OnDownload(message)">Download</button>
    </ResponseFooterTemplate>
</RadzenAIChat>