Interfaces and tutorials for `Topography.jl`necessary

[akshaysridhar]

Description

Tutorials for topography / meshwarp usage are needed: 1) Analytical descriptions 2) Read-in external topo-files.

Additionally, there is an open PR for a topography file reader #807 which will need attention in the near future: Artifacts.jl needs to be set up against the relevant sources.

Pending tasks

• [ ] Interface for external topography files onto DG grids
• [ ] Tutorials for meshwarp usage within experiment specification.
• [ ] Tutorials for usage of external data-set reader. See #807
• [ ] Tests for interfaces and interpolated information / modified bottom surface.

This will likely affect interpretation of Horizontal and Vertical directions - issue #697 tracks this.

For CLIMA Developers

• [ ] This feature can be added (if it cannot be, explain why in a comment below -- lack of technical expertise, not relevant to the scope of this project, too ambitious)
• [ ] There is a timeline for when this feature can be implemented
• [ ] The feature has been (or will be) implemented (Please link the PR)

[smarras79]

Simple starting point for this:
make a copy of the linear HS mountain wave test from open PR 1163, clean it up, and concentrate on the topography construction part of the tutorial. The initial condition can be the same of the linear HS test.