quantile: better run-time type safety for state.

The quant_fun blindly trusts that the state object has
the correct type. But the function environment is mutable.
To fix this, we end up switching the state from cptr_typed
to cobj because cptr_typed has a weak form of safety based
on symbols that is better suited for FFI stuff. For anything
built into the language, we want it to be bulletproof.

* arith.c (quant_state_s): New symbol variable.
(quant_cls): New static variable.
(psq_ops): Rename to quant_ops.
(quant_fun): Parameter renamed to state. We use
cobj_handle to get the pointer to the context structure,
using the quant_cls class.
(quantile): Use cobj to create the context object, rather
than cptr_typed.
(arith_init): Initialized quant_state_s and quant_cls.

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