Refactor codes and add unit tests

.../java/org/opengroup/osdu/indexer/model/geojson/Point.java

...r/model/geojson/jackson/GeometryCollectionSerializer.java

...osdu/indexer/model/geojson/jackson/PointDeserializer.java

...oup/osdu/indexer/service/StorageIndexerPayloadMapper.java

...sdu/indexer/util/geo/decimator/DouglasPeuckerReducer.java

...up/osdu/indexer/util/geo/decimator/GeoShapeDecimator.java

...up/osdu/indexer/util/geo/decimator/GeometryDecimator.java

...del/geojson/jackson/GeometryCollectionSerializerTest.java

.../indexer/model/geojson/jackson/PointDeserializerTest.java

...osdu/indexer/service/StorageIndexerPayloadMapperTest.java

...indexer/util/geo/decimator/DouglasPeuckerReducerTest.java

...sdu/indexer/util/geo/decimator/GeoShapeDecimatorTest.java

...sdu/indexer/util/geo/decimator/GeometryDecimatorTest.java

...l-properties/unmatched-virtual-properties-schema.json.res

...dex-virtual-properties/virtual-properties-schema.json.res

...esources/geo/decimator/geometrycollection_linestring.json

...ces/geo/decimator/geometrycollection_multilinestring.json

...esources/geo/decimator/geometrycollection_multipoint.json

...ources/geo/decimator/geometrycollection_multipolygon.json

...est/resources/geo/decimator/geometrycollection_point.json