Feature Request: Add hydrostatic balance with rotation correction to MOI Solver

[jrenaud90]

The current implementation of TidalPy's EOS solver does not account for rotation. It should be simple to add by changing the governing equations.

$$\frac{dm}{dr} = 4 \pi r^2 \rho$$

$$\frac{1}{\rho}\frac{dP}{dr} = -\frac{Gm}{r^2} + \frac{2}{3} \omega^2 r$$

Will want to do a bit more research to see if what assumptions go into this and if there are any limitations.