Change breakout example from fixed time updates to virtual time updates

[rossleonardy]

Objective

Addresses #14239
Move breakout example to use virtual time instead of fixed time updates

Solution

• The example already used time.delta().as_secs() so it wasn't very dependent on fixed time; comments on the issue suggested using StableInterpolate so I did
• I changed the paddle entity to also use a velocity to be more similar to the ball and moved its clamping behavior to a separate system (This could possibly be treated as a collision and handled in check_for_collisions? )

Testing

• I tested the example before and after the changes and verified the same behavior on a macbook m2 pro. I did not test it on other platforms.
• The changes can be tested with

cargo run --example breakout

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Showcase

Visually identical to the existing breakout example

[github-actions]

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[Demonagon]

Hi, thanks for contributing. Changing the schedule from fixed time to virtual time could make the game behave differently with large delays in time, where the ball could move beyond an obstacle. Do you think that's a fair assesment ?