Define equality on ranges.

test/range/equality.wren

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+var a = 2..5
+var b = 2..6
+var c = 2...5
+var d = 2...6
+
+IO.print(a == 2..5) // expect: true
+IO.print(a == 2..6) // expect: false
+IO.print(c == 2...5) // expect: true
+IO.print(c == 2...6) // expect: false
+
+IO.print(b != 2..5) // expect: true
+IO.print(b != 2..6) // expect: false
+IO.print(d != 2...5) // expect: true
+IO.print(d != 2...6) // expect: false
+
+IO.print(a != c) // expect: true
+IO.print(b != d) // expect: true