Function interp_op_pow 

fn interp_op_pow(
    args: &[RValue],
    _named: &[(String, RValue)],
    context: &BuiltinContext<'_>,
) -> Result<RValue, RError>

Exponentiation operator as a function.

@param e1 base @param e2 exponent @return e1 raised to the power of e2