Add bytearray basic tests.

tests/basics/bytearray1.py

+a = bytearray([1, 2, 200])
+print(a[0], a[2])
+print(a[-1])
+a[2] = 255
+print(a[-1])
+a.append(10)
+print(len(a))
+
+s = 0
+for i in a:
+    s += i
+print(s)