FPS node for geometry nodes

Currently, the Scene Time node in geometry nodes allows access to the current frame and time in second; however, it does not provide the frame rate of the scene. Although the frame rate can be calculated by dividing the current frame by the current time, this approach introduces several issues, including:

1. Division is often not precise, especially if the frame rate is not a whole number.
2. It will result in zero on frame 0.

Therefore, I propose adding of a Frame Rate output to the Scene Time node.