Integrating Many Lights Sampling into Cycles X

The Many Lights Sampling project has been a long-standing project over the course of Blender’s development. It is meant to improve Cycles render times in scenes with many lights, so that artists may be more flexible when it comes to creating and lighting environments. Although a lot of work has already been completed in regards to the Many Lights Sampling algorithm, the goal of this project is to merge this work into the main branch after sufficient testing and user feedback.