[#12749] Autosave and restore progress if user navigates away

[Respirayson]

Fixes #12749

Outline of Solution

Description

This PR introduces autosave functionality for this feedback session page. The way that I implemented it ensures that users' responses are automatically saved after they have made a change.

Some key changes

1. Autosave Implementation

• Added autosave method + events to handle the autosaving of feedback responses to local storage
• Used timeout that is started upon change in input because periodic intervals might create a potential window where the user refreshes the page before the save kicks in. And saving every input change might waste resources. So I feel that this is a best of both worlds approach to saving the data.

2. Loading autosaved data

• Lazy loading of feedback session only when the question itself is in the viewport

3. Reset

• Added a way for users to reset their response to the last submitted state so I like to think of it as a git reset --hard to help users get back to the original previous data that they had.
• And I also made a few UI changes to add the buttons in to reset the data

Video Demo

Below is a video showcasing a really quick demo of what I've done: https://github.com/Respirayson/teammates/assets/88478542/5eb944dc-37b2-4925-9b49-f46c22991558

And some screenshots:

Tooltip for relevant info

Reset button disabled when there are no changes

Also updated the grouped and ungrouped questions' UI