Fix lower FPS in D405, D455

[SamerKhshiboun]

Tracked by [LRS-527], [DSO-18534]

• Added missing params in rs_launch.py:
  • depth_module.enable_auto_exposure
  • depth_module.exposure (for manual exposure)
  • rgb_camera.enable_auto_exposure: true

• Fixing Ros2 depth_module.auto_exposure_enabled via launch file doesnt do anything #2507 D405 how to turn auto exposure on while using ros2 launch realsense2_camera rs_launch.py #2598 ROS2-beta: RGB and depth FPS is lower than configured  #2503 D455 cannot run depth at 30 HZ under ROS2 #2530 D405 fps #2486

Description:
D405, D455 models, have default manual depth exposure value of 33000
If enable_auto_exposure is off, the depth FPS of 30 will be reduced to 15, since the manual exposure is high, the camera will try to get the first frame within this 33000 [μs], but since it very close to the 30FPS high limit (33333.33333μs) and due to other FW syncs inside the camera, we are missing this 30 FPS Goal, then we lose a cycle of frames, so the FPS is cut by half.

So, if user want to turn off depth_module.enable_auto_exposure or use HDR features (which disable auto_exposure), he must set the depth_module.exposure to a value that is lower than ~32200 in order to bypass the problem I described above.

Updated the launch file to set depth_module.exposure to be 8500, to be aligned with D435 default manual exposure. User can override this in the launch file or in the ros2 run/launch cmd line

[Nir-Az]

Great investigation work!

[lifeisgood-ai]

Thanks @SamerKhshiboun