feat: replace Wren Range class with native C object for performance

Remove the Range class definition from corelib.wren and implement it as a native C type with ObjRange struct, adding native methods for from, to, min, max, iterate, and iteratorValue. Move range operator handling from Num class to native num_dotDot and num_dotDotDot functions. Update VM to support OBJ_RANGE type in marking, printing, and type checking. Add comprehensive test suite for range operations including ordered, backwards, and exclusive ranges.

test/range/iterate.wren

@@ -0,0 +1,8 @@
+var range = 1..3
+IO.print(range.iterate(null)) // expect: 1
+IO.print(range.iterate(1)) // expect: 2
+IO.print(range.iterate(2)) // expect: 3
+IO.print(range.iterate(3)) // expect: false
+IO.print(range.iterate(4)) // expect: false
+
+// TODO: Negative and empty ranges.