[Feature]: Implement a Feedback Button for Collecting User Input

[openhands-agent]

What problem or use case are you trying to solve?
http://resend.com|resend.com demonstrates a feedback interface where users can click on a 'feedback' button and provide textual insights about the application's performance. Implementing such a capability would enable users to share specific feedback directly within the OpenHands application.

Desired UX of the solution
The feedback button should be highly accessible and intuitively placed within the app interface. Once clicked, it should open a text input modal where users can type feedback and submit.

Technical implementation
Potentially leveraging a feedback collection library or creating a custom feedback submission module in React. This would involve:

• Adding a button element in the UI.
• Backend API for submitting and storing feedback.
• Optional analytics for recurring feedback themes.

Alternatives considered
<N/A>

Additional context

Issue Created By: Graham Neubig on Slack
Link to Slack Thread: https://openhands-ai.slack.com/archives/C06QT0AGY4W/p1743771702236099?thread_ts=1743771702.236099&cid=C06QT0AGY4W