add missing visibility annotations to ustdex types that have data members

[ericniebler]

Description

This should fix the build break seen by @alliepiper on #3544 and unblock the switch to use CTK 12.8 in CI

Checklist

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

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[alliepiper]

Tested locally on 12.8, fixes the issue 🙂

[github-actions]

🟩 CI finished in 7h 44m: Pass: 100%/20 | Total: 1h 54m | Avg: 5m 44s | Max: 18m 04s | Hits: 327%/522

• 🟩 cudax: Pass: 100%/20 | Total: 1h 54m | Avg: 5m 44s | Max: 18m 04s | Hits: 327%/522

  🟩 cpu
    🟩 amd64              Pass: 100%/16  | Total:  1h 42m | Avg:  6m 25s | Max: 18m 04s | Hits: 327%/522   
    🟩 arm64              Pass: 100%/4   | Total: 12m 09s | Avg:  3m 02s | Max:  3m 12s
  🟩 ctk
    🟩 12.0               Pass: 100%/1   | Total:  9m 21s | Avg:  9m 21s | Max:  9m 21s | Hits: 327%/261   
    🟩 12.5               Pass: 100%/2   | Total: 12m 15s | Avg:  6m 07s | Max:  6m 15s
    🟩 12.6               Pass: 100%/17  | Total:  1h 33m | Avg:  5m 29s | Max: 18m 04s | Hits: 327%/261   
  🟩 cudacxx
    🟩 nvcc12.0           Pass: 100%/1   | Total:  9m 21s | Avg:  9m 21s | Max:  9m 21s | Hits: 327%/261   
    🟩 nvcc12.5           Pass: 100%/2   | Total: 12m 15s | Avg:  6m 07s | Max:  6m 15s
    🟩 nvcc12.6           Pass: 100%/17  | Total:  1h 33m | Avg:  5m 29s | Max: 18m 04s | Hits: 327%/261   
  🟩 cudacxx_family
    🟩 nvcc               Pass: 100%/20  | Total:  1h 54m | Avg:  5m 44s | Max: 18m 04s | Hits: 327%/522   
  🟩 cxx
    🟩 Clang14            Pass: 100%/1   | Total:  3m 27s | Avg:  3m 27s | Max:  3m 27s
    🟩 Clang15            Pass: 100%/1   | Total:  3m 34s | Avg:  3m 34s | Max:  3m 34s
    🟩 Clang16            Pass: 100%/1   | Total:  3m 25s | Avg:  3m 25s | Max:  3m 25s
    🟩 Clang17            Pass: 100%/1   | Total:  3m 28s | Avg:  3m 28s | Max:  3m 28s
    🟩 Clang18            Pass: 100%/4   | Total: 27m 45s | Avg:  6m 56s | Max: 18m 04s
    🟩 GCC10              Pass: 100%/1   | Total:  3m 31s | Avg:  3m 31s | Max:  3m 31s
    🟩 GCC11              Pass: 100%/1   | Total:  3m 23s | Avg:  3m 23s | Max:  3m 23s
    🟩 GCC12              Pass: 100%/2   | Total: 19m 59s | Avg:  9m 59s | Max: 16m 17s
    🟩 GCC13              Pass: 100%/4   | Total: 11m 59s | Avg:  2m 59s | Max:  3m 12s
    🟩 MSVC14.36          Pass: 100%/1   | Total:  9m 21s | Avg:  9m 21s | Max:  9m 21s | Hits: 327%/261   
    🟩 MSVC14.39          Pass: 100%/1   | Total: 12m 50s | Avg: 12m 50s | Max: 12m 50s | Hits: 327%/261   
    🟩 NVHPC24.7          Pass: 100%/2   | Total: 12m 15s | Avg:  6m 07s | Max:  6m 15s
  🟩 cxx_family
    🟩 Clang              Pass: 100%/8   | Total: 41m 39s | Avg:  5m 12s | Max: 18m 04s
    🟩 GCC                Pass: 100%/8   | Total: 38m 52s | Avg:  4m 51s | Max: 16m 17s
    🟩 MSVC               Pass: 100%/2   | Total: 22m 11s | Avg: 11m 05s | Max: 12m 50s | Hits: 327%/522   
    🟩 NVHPC              Pass: 100%/2   | Total: 12m 15s | Avg:  6m 07s | Max:  6m 15s
  🟩 gpu
    🟩 v100               Pass: 100%/20  | Total:  1h 54m | Avg:  5m 44s | Max: 18m 04s | Hits: 327%/522   
  🟩 jobs
    🟩 Build              Pass: 100%/18  | Total:  1h 20m | Avg:  4m 28s | Max: 12m 50s | Hits: 327%/522   
    🟩 Test               Pass: 100%/2   | Total: 34m 21s | Avg: 17m 10s | Max: 18m 04s
  🟩 sm
    🟩 90                 Pass: 100%/1   | Total:  2m 53s | Avg:  2m 53s | Max:  2m 53s
    🟩 90a                Pass: 100%/1   | Total:  3m 02s | Avg:  3m 02s | Max:  3m 02s
  🟩 std
    🟩 17                 Pass: 100%/4   | Total: 15m 02s | Avg:  3m 45s | Max:  6m 15s
    🟩 20                 Pass: 100%/16  | Total:  1h 39m | Avg:  6m 14s | Max: 18m 04s | Hits: 327%/522   
  

👃 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: 20)

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