This patch implements the Fog Glow option in the Glare node. The
implementation does not match the existing implementation in the CPU
compositor, because it is computationally infeasible for the realtime
compositor. Instead, this implementation is similar to how Bloom is
implemented in EEVEE, based on the talk:
"Next Generation Post Processing in Call of Duty: Advanced Warfare".
This is just a temporary solution as requested by users until we either
implement an accurate implementation using FFT, provide a separate
option for EEVEE bloom, or roll out a different solution altogether.
Pull Request: https://projects.blender.org/blender/blender/pulls/106042
cc5128f6ca