acebulsk/crhmcode: CRHM model release including the Canopy Snow Mass and Energy Balance Modules (CanSnow)

CRHM model release associated with the manuscript: "An evaluation of new snow interception and ablation parameterisations in continental, subarctic, and maritime needleleaf forests" submitted to HP after first round of revisions and fixing bug in Snobal (see issue). Description of changes: Implemented new canopy snow energy and mass budgets as new CRHM modules when combined are called "CanSnow". The main changes are the addition of two new modules to represent the initial loading of snow in the canopy: CanopyVectorBased which follows developments from: Cebulski, A. C., & Pomeroy, J. W. (2025). Snow Interception Relationships With Meteorology and Canopy Density. Hydrological Processes, 39(4), e70135. https://doi.org/10.1002/hyp.70135 the second module CanopySnowBalance follows developments from: Cebulski, A. C., & Pomeroy, J. W. (2026). Processes Governing the Ablation of Intercepted Snow. Water Resources Research, 62(2), e2025WR042009. https://doi.org/10.1029/2025WR042009 Together these new modules replace the canopy snow routines previously incorporated in CanopyClearingGap. The original radiation routines in CanopyClearingGap were copied over to the CanopyVectorBased module which feeds into the surface snowpack routines so CanopyClearingGap is no longer needed. See individual commits for additional details.