Measure along / within ROIs

Not sure if this is within the scope of the project, but it would be nice to be able to measure along ROIs (e.g. a "profile line" through that moves through space in one (more, eventually?) axis. Through lines, it could be a profile line. With polygons, it could be average intensity (or any other function that takes a set of pixels and returns a number), or a profile line along the circumference of the shape.

Something like this as an example of the profile line:

I worked on something like this a couple of years ago, and might give it a shot when I have the time, but I thought I'd leave this here so I could remember, and if it inspired anyone else to give it a shot since I think it'd be very useful!

En el issue no se menciona ningún archivo, prueba ni punto de entrada. Empieza revisando los puntos de entrada existentes del repositorio para ROI y plotting, y después aclara si los perfiles de línea, la agregación de polígonos y los perfiles de circunferencia están incluidos en el alcance. La tarea debe considerarse terminada cuando las mediciones de ROI compatibles y su comportamiento esperado estén definidos explícitamente.