Improve utility of IntArray and LongArray

This patch adds several utility methods to IntArray and LongArray to
make them more useful in the context of a Parcelable class.

More specifically, it is now possible to parcel and unparcel a
{Int, Long}Array with the following one liners:
  - mIntArray = IntArray.wrap(parcel.createIntArray());
  - parcel.writeIntArray(mIntArray.toArray());

This patch also
  - adds unit tests for IntArray and LongArray.
  - adds a method for setting a field at a given index.
  - adds a method for changing the effective array length.
  - adds missing bound checks for negative index values.

Test: added test coverage
Bug: 34901696
Change-Id: Ia0febf4dae048b0a45c75310b5d90b56499320da