[AIChat] - Provide Feedback UI

[Brandon-T]

Feature Overview

• The provide Feedback UI allows the user to provide feedback via a drop-down of selected options, and via entering some text or via voice-assistant
• In a chat, a user can be prompted to "provide feedback" to the AI to let us know whether the response was helpful or not.

Implementation Details

• Implement the ability to select an option
• Implement the ability to enter feedback text via keyboard
• Implement the ability to enter feedback via voice-assistant
• Implement the Learn-More link text
• Implement the cancel/submit buttons

[kjozwiak]

As per brave/brave-browser#36585 (comment) & https://bravesoftware.slack.com/archives/C04KPE0BUDU/p1709872123838319?thread_ts=1709830872.231289&cid=C04KPE0BUDU, going to close this one off as QA/No and release-notes/exclude as we'll use brave/brave-browser#36585 as a guide/main issue to run through Leo via 1.63.x.