trunk/9973ec93082df39bffc41a1d0e26d368e4defef0: [Operators] Implement nb_power / nb_inplace_power in Dynamo (#186296)

Wires operator.pow and operator.ipow through ternary_op /

ternary_iop in BuiltinVariable, removing them from the old

_handle_op_in_graph table. Adds nb_power_impl (with reverse)

and nb_inplace_power_impl to VariableTracker, ConstantVariable,

TensorVariable, SymNodeVariable, and UserDefinedObjectVariable.

Power is ternary, so the modulus-position slot (CPython's z-slot) gets

its own nb_power_z_impl method to avoid conflating it with the

forward/reflected roles that reverse: bool captures. ternary_op

dispatches the z-slot through nb_power_z_impl(self=z, tx, v, w).

Co-authored-by: Claude Sonnet

Pull Request resolved: #186296

Approved by: https://github.com/rtimpe