[CUDAX] Remove launch overloads taking dimensions and make everything except make_hierarchy return kernel_config

[pciolkosz]

I believe that at this point launch overloads taking hierarchy_dimensions instead of kernel_config is more of a past design artifact.
Hierarchy design predates kernel config and initially launch overloads taking a hierarchy were provided to make sure user won't need to take that extra step of converting hierarchy to a config (implicit conversion was not possible as well).
Recently make_config was extended to accept hierarchy levels. Now given a set of levels, if no launch options are needed the difference is literally make_hierarchy producing a hierarchy type and make_config producing a kernel config containing the same hierarchy.
I believe we should force users to use the kernel_config type in majority of cases and make it the only possible launch argument for below reasons:

• It simplifies kernels that take config/dimensions as argument, before there was ambiguity which one to expect, now its consistent.
• It simplifies that even further with the upcoming default kernel configuration, where kernel and launch site could have a mix of hierarchies or configs and it would be difficult to track what will end up being passed into the kernel. Trying to handle all of these cases in the implementation would also be a major pain
• I think even for shorthands for config creation, I think I prefer distribute<N>(M).add(option1, option2) vs make_config(distribute<N>(M), option1, option2). I like how now user is mostly concerned about manipulating configs, instead of both hierarchies and configs and how they interact, unless they have some very specific case.
• Operating only on configs is also closer to the equivalent launch function in python.

As a consequence of this change I also changed distribute and all of the operator& to return kernel_config so it works well with launch. I think we should keep make_hierarchy function for some special cases user would be interested only in the hierarchy type, but vast majority of cases it shouldn't be needed.

[github-actions]

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👃 Inspect Changes

Modifications in project?

	Project
	CCCL Infrastructure
	libcu++
	CUB
	Thrust
+/-	CUDA Experimental
	python
	CCCL C Parallel Library
	Catch2Helper

Modifications in project or dependencies?

	Project
	CCCL Infrastructure
	libcu++
	CUB
	Thrust
+/-	CUDA Experimental
	python
	CCCL C Parallel Library
	Catch2Helper

🏃‍ Runner counts (total jobs: 54)

#	Runner
43	linux-amd64-cpu16
5	linux-amd64-gpu-v100-latest-1
4	linux-arm64-cpu16
2	windows-amd64-cpu16

[miscco]

Question: Do we really need make_hierarchy? Wouldnt it make everything easier if a user would always create a config and then can get the hierarchy information from the config?