[STF] Create dot sections to possibly collapse nodes when displaying large DOT graphs

[caugonnet]

Description

Displaying large graphs is a challenge, so we introduce sections which can be used to collapse nodes so that we can concentrate on visualizing what is important at the algorithmic level. We could have a new variable like CUDASTF_DOT_MAX_DEPTH=2

Checklist

• [ x] New or existing tests cover these changes.
• The documentation is up to date with these changes.

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[miscco]

/ok to test

[github-actions]

🟩 CI finished in 35m 02s: Pass: 100%/54 | Total: 11h 11m | Avg: 12m 26s | Max: 15m 28s | Hits: 90%/256

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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