ldproxy extent handling

[PZahnen]

No description provided.

[azahnen]

• TemporalExtent
  • should be UTC ISO datetime (YYYY-MM-DDTHH:mm:ss.sssZ)
  • use DateTimeFormatter.ISO_INSTANT.parse to validate
  • add methods for start and end (@Value.Derived, @JsonIgnore) that return Instant (Instant.from(DateTimeFormatter.ISO_INSTANT.parse))
• SpatialExtent
  • toBoundingBox should be moved here with nativeCrs as parameter
• FeatureProvider*
  • it seems there is a lot of duplicated code, move to AbstractFeatureProvider where appropiate

[PZahnen]

Thanks, should be taken care of now.