EEVEE-Next: Expose Fast GI ray and step count

This allow to reduce the amount of noise and reduce
the lost energy caused by low thickness and large
stride (low sample count).

Actual number of rays is twice the UI count.

scripts/startup/bl_ui/properties_render.py

@@ -622,6 +622,10 @@ class RENDER_PT_eevee_next_gi_approximation(RenderButtonsPanel, Panel):
         layout.use_property_split = True
         layout.use_property_decorate = False
 
+        col = layout.column( align=True)
+        col.prop(props, "fast_gi_ray_count", text="Rays")
+        col.prop(props, "fast_gi_step_count", text="Steps")
+
         col = layout.column()
         col.prop(props, "horizon_quality", text="Precision")
         col.prop(props, "horizon_thickness", text="Thickness")