Merge branch 'gcapodag/mpaso/wd' (PR #6074)

Add wetting and drying capability to local time-stepping scheme

This PR adds a wetting and drying capability to the local time-stepping
(LTS) scheme for the barotropic ocean already available in master. The
PR also adds several improvements for the LTS scheme not related to
wetting and drying like for instance the upwind option for the
layerThickEdgeFlux and inline tidal boundary conditions needed to run
the drying slope test case from Compass. A separate PR on Compass will
include drying slope, dam break, and parabolic bowl test cases for LTS.

[BFB] - MPAS-Ocean standalone only