Kernel decorator fix

I have introduced a change to the kernel decorator, which was completely wrong. Now I reintroduced the kernel decorator and introduced a kernel_config decorator, which receives a CreateKernelConfig, which is also returned together with the list of assignments as a dict. The dict has to be unrolled for create_kernel. The kernel_config decorator updates the name of the function inside the config.

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merged

mentioned in commit a3ba7708