Lit and Unlit modes implementation

[SYBIOTE]

Summary

fixes the drop shadows in the application. The changes ensure that the drop shadows are correctly applied to mesh and model and primitive geom entities.

Subtasks Checklist

Breaking Changes

References

https://tsu.atlassian.net/browse/IR-2264

QA Steps

[SYBIOTE]

for the lit - unlit implementation, I hide all light in unlit mode and turn on the lights when in any other mode
in unlit mode we add a temp ambient light to the scene and remove it when we are in any other mode