Add PouleyKetchoupp to owners for physics tests

.github/CODEOWNERS

@@ -4,3 +4,5 @@
 
 /misc/2.5d           @aaronfranke
 /mono/2.5d           @aaronfranke
+/2d/physics_tests    @pouleyKetchoupp
+/3d/physics_tests    @pouleyKetchoupp