Use multiple crop angles

[Chambana]

My robot has several things blocking the LIDAR and I want to drop out 4 different rangles of angles. Can you please modify the ROS2 driver to support multiple crop angles?

[bperseghetti]

@Chambana added option for setting area mask so you can mask/filter out returns for transient events (like an elevated magnetometer cable in FOV) works great in Nav2 and reduces CPU load a ton. Means you can remove based on spatial location instead of losing all the data from having to guess orientation in angle offset.
Here is the PR: #14