[Improvement] make shadow camera near- and far-plane distance settings available to lua

As discussed with Ivand, who said it could be possible.
If we have the shadow map camera near- and far-plane distances adjustable dynamically through lua, we could try to improve that on the game-side (tied to the camera angle in the camera widget).

https://learn.microsoft.com/en-us/windows/win32/dxtecharts/common-techniques-to-improve-shadow-depth-maps?redirectedfrom=MSDN#calculating-the-near-plane-and-far-plane

No source files or tests are named. Start by locating the shadow-map camera setup and its Lua binding surface, then verify that near- and far-plane distances can be changed dynamically from Lua and affect the shadow camera.

Written by the indexing model from the issue text.