Visibility controls on public API #607

Job	Run time
Build (docker-linux-x64)	46m 12s
clang-tidy	10m 57s
clang-format	20s
Build (docker-linux-arm64)	34m 57s
Build (windows-x64)	41m 16s
Build (macos-arm64)	8m 11s
Build (macos-x64)	1h 4m 45s
Build (linux-x64)	18m 44s
Build (linux-arm64)	14m 37s
Pin Check / Pin Check	11s
License Check / License Check	4s
Build (cpp-example-collection-linux-arm64)	5m 21s
Build (cpp-example-collection-x64)	6m 32s
	4h 12m 7s

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