[Java] support speedup inner serialization by using outer generics info

[chaokunyang]

Is your feature request related to a problem? Please describe.
For class with nested generics such as:

class Foo {
  List<Integer> intLists;
  Map<String, List<Long>> map;
}

If we push Integer type to ListSerializer and String, List<Long> to MapSerializer, then ListSerializer will know every element is an Integer, there will be no need to query element serializer and write element type every time serializing those elements, thus much space/time efficient.

MapSerializer can use same mechanism. Also when serializing List<Long> value, MapSerializer can push Long to ListSerializer, which make nested list serialization more efficient too.

Java generics is erasured at runtime,List type won't have element type. We need a way to push and propagate those erasured generics along the serialization.

Describe the solution you'd like

• Using guava TypeToken to extract generics
• Create an Generics to record generics hierarchy and current generics
• Create an GenericType to tracking children generics and binding serializer to reduce map loopup cost

Additional context
#70