rotation ped to edge value from intrinsic rotation

[TimSlendebroek]

Let's write a function that estimates the intrinsic rotation as @jmcclena suggested as "pedestal" value of the H-mode profiles in the init_core_profiles()

paper in question https://pubs.aip.org/aip/pop/article/24/4/042501/110237/Dependence-of-intrinsic-torque-and-momentum

it might not matter for transport as it's the shear (and the shear on the transport grid will be near zero for anything power plant size) but for stability in the future it will be? ( @tylerbcote probably knows )

[TimSlendebroek]

this is also something you could look at if you are interested @avdeevag