[SPARK-12834] Change ser/de of JavaArray and JavaList

https://issues.apache.org/jira/browse/SPARK-12834

We use `SerDe.dumps()` to serialize `JavaArray` and `JavaList` in `PythonMLLibAPI`, then deserialize them with `PickleSerializer` in Python side. However, there is no need to transform them in such an inefficient way. Instead of it, we can use type conversion to convert them, e.g. `list(JavaArray)` or `list(JavaList)`. What's more, there is an issue to Ser/De Scala Array as I said in https://issues.apache.org/jira/browse/SPARK-12780

Author: Xusen Yin <yinxusen@gmail.com>

Closes #10772 from yinxusen/SPARK-12834.