Improve ChromeTraceUtil logging, allow filename to be specified.

Expose this ChromeTraceUtil  logging to C-API: start/statelogging and submitProfileTiming
pybullet.submitProfileTiming, and STATE_LOGGING_PROFILE_TIMINGS used in startStateLogging
added example for Python profileTiming.py and C++ b3RobotSimulatorClientAPI::submitProfileTiming

examples/pybullet/examples/profileTiming.py

@@ -0,0 +1,12 @@
+import pybullet as p
+import time
+
+p.connect(p.GUI)
+
+t = time.time()+0.1
+
+logId = p.startStateLogging(p.STATE_LOGGING_PROFILE_TIMINGS, "haha")
+while (time.time()<t):
+	p.submitProfileTiming("pythontest")
+p.stopStateLogging(logId)
+