feat(#286): add serializers for ZoneId, ZoneOffset, ZonedDateTime and OffsetDateTime

[arnaud-daroussin]

Hi @novakov-alexey,

Here is the firsts serializers teased in #286:

• java.time.ZoneId
• java.time.ZoneOffset
• java.time.ZonedDateTime
• java.time.OffsetDateTime

These serializers are quite straightforward but I have few things to check with you:

• I introduced new 2 constants:
  • VariableLengthDataType with value -1 to indicate a variable length for the serializer, I replaced it everywhere and made 2 small optimizations in CoproductSerializer and EitherSerializer, if you are OK with them (fixed length data when possible allows Flink to do some optimizations especially on keys).
  • NullMarker with value Int.MinValue to mark a null value. Using Int.MinValue to be outside -64800 to +64800 validity range for ZoneOffset.
• I added SimpleTypeInfo to replace SimpleTypeInformation. It's a simple case class simpler to use than abstract SimpleTypeInformation which require to create a subclass for each use. I don't know if you want to keep SimpleTypeInformation, I only deprecated it for now.

[arnaud-daroussin]

Do you agree with choices made in this PR? On my side, I think it's ready to be merged.

[novakov-alexey]

Hi @arnaud-daroussin , yes, it looks great. Sorry for delay.