tests/jni: Add test for working with container of List interface.

tests/jni/list.py

+import sys
+import jni
+try:
+    ArrayList = jni.cls("java/util/ArrayList")
+except:
+    print("SKIP")
+    sys.exit()
+
+l = ArrayList()
+print(l)
+l.add("one")
+l.add("two")
+
+print(l.toString())
+print(l)
+print(l[0], l[1])

tests/jni/list.py.exp

+[]
+[one, two]
+[one, two]
+one two