Generalizing GFS_typedefs for multiple dynamical cores

[dustinswales]

Description

The GFS_typedefs data container contains data needed by the physics and for coupling to/from the FV3 dynamical core. Data needed by the physics could be shared by dynamical cores, whereas data for coupling back and forth between the physics FV3 is dycore specific. With a new dynamical core in the UFS, this distinction should be clear

Solution

Pull FV3 specific data out of GFS_typedefs and put it in it's own data container. This could illustrate to future dycore implementers where they need to interface their coupling with.