Visibility controls on public API #598

Job	Run time
clang-format	23s
Build (docker-linux-arm64)	34m 31s
Build (docker-linux-x64)	45m 5s
clang-tidy	11m 4s
Build (windows-x64)	35m 22s
Build (linux-x64)	18m 34s
Build (linux-arm64)	15m 51s
Build (macos-arm64)	8m 24s
License Check / License Check	5s
Build (macos-x64)	27m 19s
Pin Check / Pin Check	15s
Build (cpp-example-collection-linux-arm64)	3m 59s
Build (cpp-example-collection-x64)	4m 5s
	3h 24m 57s

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