cudax: rename ustdex's __query member function to query

[ericniebler]

Description

now that P3325, "A Utility for Creating Execution Environments", has passed LEWG electronic polling for C++26, it feels like the right time to rename the __query member function to query. this brings cudax's std::execution bits closer in line with the standard.

Checklist

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

[github-actions]

🟩 CI finished in 20m 27s: Pass: 100%/54 | Total: 4h 14m | Avg: 4m 42s | Max: 15m 47s | Hits: 68%/238

• 🟩 cudax: Pass: 100%/54 | Total: 4h 14m | Avg: 4m 42s | Max: 15m 47s | Hits: 68%/238

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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