SIM: MPC: add two x500 lidar airframes

[Claudio-Chies]

Partly Tracked in #23602
To be merged only when following PR is merged

• Add X500 Lidar Models PX4-gazebo-models#62

other relevant PR's

• update the 2d lidar models, and add the new 1D lidar models PX4-user_guide#3452

Overview

This PR Adds two X500 models, one with a front facing rangefinder for collision prevention, and one down facing lidar for normal rangefinder use case testing.
I also renamed the x500_lidar to x500_lidar_2d, to better differentiate the three

Changes:

New Models:
x500_lidar_front
x500_lidar_front
Changes:
x500_lidar --> x500_lidar_2d

Changelog Entry

For release notes:

Feature: Added front and downfacing MPC Models for SITL Testing
Documentation: read docs.px4.io/main/en/sim_gazebo_gz/vehicles.html

Test coverage

• Tested in SITL

Open Tasks:

• Update the Docs
• Update the Git Submodules, once the models have been merged.
• Add Meshes to the sensors.

[hamishwillee]

For docs, we want to know how they are used/invoked, what they allow you to test when using that frame (such as terrain following, collision detection etc) [i.e. if enabled by default], and any limits - i.e. rangefinder max/min distance.

[Jaeyoung-Lim]

Overall, looks good to me!

Just a question, is it possible to have both a 2d lidar and a lidar for a distance sensor?

[Claudio-Chies]

@Jaeyoung-Lim yea. This should be possible, as the two publish to different topics, and GZBridge is able to differentiate them by that.