[IMP] survey: animate leaderboard in survey sessions

Purpose
=======

This commit intends to improve the animations on the leaderboard during survey
sessions. We now show both the ranking of each attendee before and after taking
into account the current question scores.

It allows attendees to see their position in the leaderboard shifting up / down
depending on how well they answered, and adds a bit more interactivity during
the session.

Specs
=====

The code changes to make this happen implied having multiple layers of
animations running one after the other.
The use of async/await in the JS allowed for a much smoother and less indented
code, simplifying the reading.

We now have 2 different "bars" to handle:
The bar that shows the previous leaderboard position.
The bar that shows the current question score.

This means we handle both jQuery items and modify their size & transition
properties depending on our animation.

Unfortunately, all these animations required a lot of testing to find fitting
timings, which means using quite a few setTimeout with "magic" delays.
These were just the most good looking ones and it feels like naming them with
a constant would not really help.

We also slightly improved the graphic font size / styling to make it easier to
read for potentially far away attendees.

Task 2235815

closes odoo/odoo#50991

Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>

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