Initialize object array

I fixed this bug.
---- Java ----
public void func() {
  Object[] arr = new Object[10];
}

---- Kotlin ----
public void func() {
  var arr : Array<Any?>? = Array<Any?>(10) // hope : arrayOfNulls<Any?>(10) 
}

I added two test files and fixed two test files.
Add
  arrayInitializerExpression/statement/objectArrayWithLength
  arrayInitializerExpression/statement/intArrayWithLength

Fix
  arrayType/statement/d2StringEmptyArray
  arrayType/statement/d3StringEmptyArray

I fixed ast.ArrayWithoutInitializationExpression.kt to pass those tests.
Please check my codes.