Support next(), pairs(), ipairs() for LL.setdtor() table proxies.

Replace the global next(), pairs() and ipairs() functions with a C++ function
that drills down through layers of setdtor() proxy objects and then forwards
the updated arguments to the original global function.

Add a Luau __iter() metamethod to setdtor() proxy objects that, like other
proxy metamethods, drills down to the underlying _target object. __iter()
recognizes the case of a _target table which itself has a __iter() metamethod.

Also add __idiv() metamethod to support integer division.

Add tests for proxy // division, next(proxy), next(proxy, key), pairs(proxy),
ipairs(proxy) and 'for k, v in proxy'. Also test the case where the table
wrapped in the proxy has an __iter() metamethod of its own.

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