GEOMESA-3408 Document feature-to-feature converter #1843

Job	Run time
build-and-test / build-scala	4m 36s
build-and-test / arrow-tests / unit-tests	50s
build-and-test / accumulo-other-tests / unit-tests	5m 23s
build-and-test / accumulo-ds-tests / unit-tests	6m 51s
build-and-test / cassandra-tests / unit-tests	1m 2s
build-and-test / convert-tests / unit-tests	1m 38s
build-and-test / cqengine-tests / unit-tests	32s
build-and-test / features-tests / unit-tests	45s
build-and-test / fs-tests / unit-tests	3m 52s
build-and-test / gt-tests / unit-tests	1m 0s
build-and-test / hbase-tests / unit-tests	2m 28s
build-and-test / kafka-tests / unit-tests	2m 38s
build-and-test / lambda-tests / unit-tests	2m 37s
build-and-test / metrics-tests / unit-tests	33s
build-and-test / other-tests / unit-tests	1m 13s
build-and-test / process-tests / unit-tests	29s
build-and-test / spark-tests / unit-tests	1m 50s
build-and-test / redis-tests / unit-tests	1m 5s
build-and-test / utils-tests / unit-tests	36s
build-and-test / integration-tests / integration-tests	4m 50s
	44m 48s

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