Add visibility setting to BUILD #305

Job	Run time
tests	28s
lint	22s
windows-cmake-build (walltime)	3m 49s
windows-cmake-build (off)	2m 24s
windows-bazel-build (walltime)	1m 45s
cmake-integration-tests (instrumentation, ubuntu-latest)	3m 14s
windows-bazel-build (off)	1m 54s
cmake-integration-tests (off, ubuntu-latest)	1m 9s
cmake-integration-tests (walltime, codspeed-macro)	3m 21s
bazel-integration-tests (walltime, codspeed-macro)	2m 58s
bazel-integration-tests (off, ubuntu-latest)	53s
bazel-integration-tests (instrumentation, ubuntu-latest)	3m 5s
	25m 22s

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