Refactor surface directory

[HansKallekleiv]

• Replace existing StaticSurfaceDirectory and DynamicSurfaceDirectory endpoints and service layer with a single SurfaceDirectory, which is a list of all surfaces with additional metadata sorted by stratigraphical order. Non-stratigraphical surfaces are placed last in the list.

• Rename surface metadata to more descriptive properties.

• Move some of the logic of filtering the directory to a typescript class

• [ ] Add reusable SurfaceSelect react component

• Update existing Map and TopographicMap modules to use the new directory

• Add stratigraphy ordering from Smda.

• Update remaining endpoints and logic to retrieve the surface data

Closes #265

[sigurdp]

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