implement spatially varying decay rates for internal tides leakage

[raphaeldussin]

This allows to change the decay time for different latitudes, tidal harmonic and vertical mode, like is done in Fig 4 of
de Lavergne 2019

[Hallberg-NOAA]

This is looking better, but now there is a variable description that no longer works. Please revise this description, perhaps as suggested in the specific comment. Once this is done, I think that this will be good to go.

[Hallberg-NOAA]

This PR has passed pipeline testing at https://gitlab.gfdl.noaa.gov/ogrp/mom6ci/MOM6/-/pipelines/26041.