Fix sizes often called sizes although they represent half-extent

[adriengivry]

Description

Many component (reflection probe, ambient box light, etc.) have "size" settings, however, the underlying value actually represent the half-extents of the size. This can lead to confusion

Expected Solution

Harmonize and/or modify all the components to use full size instead of half-extents.
For instance, if you create an ambient light box and set its size to (1, 1, 1), it should be exactly 1 unit in space, same as the cube.

Debug render passes will need to be updated, and code that relies on sizes will also need to be updated.