Initial implemation of water balance in bulk snow scheme

Brian Groenkerequested to merge
bgroenke/cryogridjulia:feature/snow-water-fluxes into master

This PR implements WaterBalance for the Bulk parameterization of Snowpack.

Other changes:

  • Implements advective energy fluxes at boundaries (i.e. interact!).
  • Refactors the SnowMassBalance into subtypes DynamicSnowMassBalance and PrescribedSnowMassBalance.
  • Reorganizes code in the Snow module.
  • Adds support for coupling the surface energy and water balance schemes.
  • Improves the implementation of ET fluxes in Hydrology module.

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