Add a revolution counter handler

As pointed out by @bryan on this thread : https://forum.orekit.org/t/at-the-same-time-the-satellite-circle-number-corresponding-to-the-window-and-the-circle-time-are-calculated-whether-the-orbit-is-raised-or-lowered/4085/4, a revolution counter is something that is often asked on the forum and it would be interesting to implement it.