Function getEquivalencyTypeForLayers

getEquivalencyTypeForLayers(layer1Input, layer2Input): "none" | "solid" | "loose"
Gets an equivalency type for two layer objects.

Matching layers are considered a solid match by: object reference, layer id, group layer + layer title, layer url + layer title.

Matching layers are considered a loose match by: layer url, layer title.

If either layer is undefined, "none" is returned.
Parameters
- layer1Input: Layer | LayerJson | LayerProperties
  The first layer to compare.
- layer2Input: Layer | LayerJson | LayerProperties
  The second layer to compare against.
Returns "none" | "solid" | "loose"
The type of equivalency for the two layers. "none" = not a match. "solid" = a strong match. "loose" = a fuzzy match.