[STF] Add concepts for STF classes

[caugonnet]

Description

If we want to compose context implementations, we may add some concepts to avoid programming mistakes (and maybe specify the interface)

closes

Checklist

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

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[caugonnet]

/ok to test 029a97f63

[github-actions[bot]]

🟨 CI finished in 19m 09s: Pass: 7%/26 | Total: 1h 14m | Avg: 2m 52s | Max: 9m 48s | Hits: 95%/568

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👃 Inspect Changes

Modifications in project?

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

Modifications in project or dependencies?

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

🏃‍ Runner counts (total jobs: 26)

#	Runner
17	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