[LIB REQUEST]: Add ROS/ROS2

### Library name

ROS

### Library description

The Robot Operating System (ROS) is a set of software libraries and tools that help you build robot applications.

### Library repository

https://github.com/ros/ros

### Motivation

This would be useful so as to run small snippets of code with the library without having to mock it.

```c++
#include
#include

int main() {
std::cout << ros::Time::now().toSec();
}
```

Start by reviewing the ROS repository linked in the request and the included C++ example using ros/ros.h and ros::Time::now(). Determine how ROS/ROS2 library support is represented in Compiler Explorer; done means the example can run without mocking the library.

Written by the indexing model from the issue text.