Add wet/dry functionality for the 2D Multilayer-SWE #196

Job	Run time
tree_1d - ubuntu-latest - x64 - pull_request	7m 25s
tree_2d - ubuntu-latest - x64 - pull_request	10m 11s
structured_2d - ubuntu-latest - x64 - pull_request	4m 54s
unstructured_2d - ubuntu-latest - x64 - pull_request	9m 7s
unit - ubuntu-latest - x64 - pull_request	3m 40s
coverage - tree_1d - ubuntu-latest - x64 - pull_request	6m 29s
upstream - ubuntu-latest - x64 - pull_request	5m 38s
coverage - tree_2d - ubuntu-latest - x64 - pull_request	9m 41s
upstream - macos-latest - aarch64 - pull_request	4m 18s
upstream - windows-latest - x64 - pull_request	8m 55s
coverage - structured_2d - ubuntu-latest - x64 - pull_request	4m 22s
coverage - unstructured_2d - ubuntu-latest - x64 - pull_request	8m 18s
coverage - unit - ubuntu-latest - x64 - pull_request	3m 5s
	1h 26m 3s

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