expose shadowMapResolution (texture resolution) and shadowMapWorldSize (size in meters in world space)

expose pybullet.ConfigureOpenGLVisualizerRequest(lightPosition=[x,y,z], shadowMapWorldSize=10.5, shadowMapResolution=16384)
See examples/pybullet/examples/configureDebugVisualizer.py for an example.
This reimplements https://github.com/bulletphysics/bullet3/pull/2295 but without creating a new command/status and explicitly referring to the debug visualizer
(since the 'getCameraImage' also has a lightPosition)

examples/pybullet/examples/configureDebugVisualizer.py

@@ -0,0 +1,20 @@
+import pybullet as p
+import math
+import time
+dt = 1./240.
+
+p.connect(p.GUI)
+p.loadURDF("r2d2.urdf",[0,0,1])
+p.loadURDF("plane.urdf")
+p.setGravity(0,0,-10)
+
+radius=5
+t = 0
+p.configureDebugVisualizer(shadowMapWorldSize=5)
+p.configureDebugVisualizer(shadowMapResolution=8192)
+while (1):
+  t+=dt
+  p.configureDebugVisualizer(lightPosition=[radius*math.sin(t),radius*math.cos(t),3])
+  
+  p.stepSimulation()
+  time.sleep(dt)