Rename managed_memory_resource to unified_memory_resource

[miscco]

This renames the memory resource and also makes it so that it shows up in our docs

[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: 22)

#	Runner
13	linux-amd64-cpu16
4	linux-arm64-cpu16
2	windows-amd64-cpu16
2	linux-amd64-gpu-rtx2080-latest-1
1	linux-amd64-gpu-h100-latest-1

[pciolkosz]

I have mixed feelings about this. In the programming guide unified memory is not the same thing as manage memory.
https://docs.nvidia.com/cuda/cuda-c-programming-guide/#unified-memory-introduction
I think if this is always using managed memory we might want to keep that name