add realsense d455 config

[zengxiaolei]

https://github.com/zengxiaolei/robotics_demo/blob/master/localization/VO/vins-fusion-d455.mp4

[heng5010]

acc_n: 0.1
gyr_n: 0.01
acc_w: 0.001
gyr_w: 0.0001
I used imu parameters those were calibrated by myself and faild.But succeed with your parameters. How did you get these imu parameters?Thank you!

[camron-BHF]

I am getting a wait for image and imu warning and when I echo topics it seems like no data is being transmitted. DId you encounter this issue, and how did/would you solve it?