refactor layers-info handler

[rgwozdz]

allow handler to be used directly instead of only within route module; preliminary work to facilitate edit capability.

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Latest commit: c53cdcdc7706f1ab1c87a9205dfdef719da6bfc6

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Coverage Report (change vs master)

File Path	Statements	Branches	Functions	Lines
packages/featureserver/src/index.js	100.0 vs 100.0	100.0 vs 100.0	100.0 vs 100.0	100.0 vs 100.0
packages/featureserver/src/layers-info-handler.js	100.0 vs (NA)	100.0 vs (NA)	100.0 vs (NA)	100.0 vs (NA)
packages/featureserver/src/rest-info-route-handler.js	100.0 vs 100.0	100.0 vs 100.0	100.0 vs 100.0	100.0 vs 100.0
packages/featureserver/src/route.js	84.9 vs 85.7	76.5 vs 76.5	100.0 vs 100.0	84.9 vs 85.7
packages/featureserver/src/server-info-route-handler.js	100.0 vs 98.1	100.0 vs 100.0	100.0 vs 100.0	100.0 vs 98.1
packages/featureserver/src/helpers/combine-body-query-params.js	100.0 vs (NA)	100.0 vs (NA)	100.0 vs (NA)	100.0 vs (NA)
packages/featureserver/src/helpers/index.js	100.0 vs 100.0	100.0 vs 100.0	100.0 vs 100.0	100.0 vs 100.0
packages/featureserver/src/helpers/normalize-input-data.js	100.0 vs 100.0	100.0 vs 100.0	100.0 vs 100.0	100.0 vs 100.0
packages/featureserver/src/helpers/normalize-request-params.js	100.0 vs 100.0	100.0 vs 100.0	100.0 vs 100.0	100.0 vs 100.0
packages/featureserver/src/helpers/validate-info-route-params.js	100.0 vs (NA)	100.0 vs (NA)	100.0 vs (NA)	100.0 vs (NA)
packages/output-geoservices/src/index.js	100.0 vs 100.0	100.0 vs 100.0	100.0 vs 100.0	100.0 vs 100.0