Create wire frame of domain to overlay over products

Describe the New Feature

Add another overlay layer, similar to political boundaries, that is a simple black wire frame of the computational domain. This can be displayed by default when the forecast viewer is launched, so the user can quickly orient themselves to where their domain is on the map. This may also help with uncertainty about what's happening when a product selected has zeros and nothing shows up.

Likely some overlap with issue #144.

Acceptance Testing

Wireframe domain should automatically appear when a forecast viewer is launched. This should be tested for a couple different domains with both Lambert and Mercator projections.

Time Estimate

? - Will be scoped out in future discussions

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Start by locating the forecast viewer entry point and the existing political-boundary overlay implementation. Determine how a domain wireframe can be rendered for Lambert and Mercator projections, then verify that it appears on launch for multiple domains and helps distinguish empty products.