[Java] object serialization support

[chaokunyang]

Is your feature request related to a problem? Please describe.
Add object serialization support, serialize all non-transient/non-stiatic fields.

Classes implemented writeObject/readObejct/writeReplace/readResolve are not handled by this serializer.

Describe the solution you'd like

• Primitive types should be handled specially to avoid boxing cost
• Swich should be used for common types to avoid virtual method call cost