unit test for LDOS and extraction efficiency using narrow bandwidth/large cutoff source #2209
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Related to #2148.
Adds a unit test for the LDOS feature involving the light extraction efficiency of a point dipole in a dielectric layer above a lossless metallic ground plane. The test verifies that the extraction efficiency computed in cylindrical and 3D Cartesian coordinates agree. A schematic of the simulation layout for the two coordinate systems is shown below.
A tutorial based on this calculation will be added in a separate PR.
This PR also modifies the existing LDOS unit test for the Purcell enhancement factor to use a source in cylindrical coordinates with narrower bandwidth and larger cutoff as described in #2182 (comment).
cylindrical
3D ($xz$ cross section)
