[Feature]: Add transition when starting a game

[Rafajrg21]

Feature Summary

When both players are ready we should see a transition to indicate the players that they are leaving the lobby and starting the game.

Detailed Description

Right now, when both players are ready, we jump to the game, and there is no transition that they are leaving the lobby.

This is just one part of the solution; we should add an animation to transition from the lobby to the game.

The transition I thought of is to have bubbles fill the screen; we could do something similar to a Spongebob transition. This animation goes with the marine theme of Cuttle, and it should add a lot of flare to the current state of the lobby.

This animation would play when both players are ready; after it is finished, we should redirect to the game.

The animation would be something like this

This is the third step in a four-step upgrade to the "start game" animation bundle. Second step: #792