Add rules and coverage code owners.
Add rules and coverage code owners.

Closes #5717.

PiperOrigin-RevId: 206766293

ulfjack/bazel,ulfjack/bazel,meteorcloudy/bazel,safarmer/bazel,ulfjack/bazel,meteorcloudy/bazel,davidzchen/bazel,akira-baruah/bazel,akira-baruah/bazel,aehlig/bazel,perezd/bazel,cushon/bazel,twitter-forks/bazel,ButterflyNetwork/bazel,dropbox/bazel,twitter-forks/bazel,bazelbuild/bazel,perezd/bazel,perezd/bazel,dslomov/bazel,davidzchen/bazel,aehlig/bazel,werkt/bazel,bazelbuild/bazel,twitter-forks/bazel,safarmer/bazel,ButterflyNetwork/bazel,davidzchen/bazel,akira-baruah/bazel,werkt/bazel,davidzchen/bazel,dslomov/bazel,davidzchen/bazel,meteorcloudy/bazel,dropbox/bazel,dslomov/bazel,akira-baruah/bazel,dslomov/bazel-windows,cushon/bazel,cushon/bazel,perezd/bazel,perezd/bazel,ulfjack/bazel,ulfjack/bazel,akira-baruah/bazel,katre/bazel,katre/bazel,dslomov/bazel-windows,cushon/bazel,aehlig/bazel,davidzchen/bazel,ButterflyNetwork/bazel,twitter-forks/bazel,dslomov/bazel,bazelbuild/bazel,twitter-forks/bazel,katre/bazel,werkt/bazel,dslomov/bazel,dslomov/bazel,meteorcloudy/bazel,aehlig/bazel,aehlig/bazel,cushon/bazel,werkt/bazel,ulfjack/bazel,dslomov/bazel-windows,safarmer/bazel,meteorcloudy/bazel,bazelbuild/bazel,dropbox/bazel,perezd/bazel,akira-baruah/bazel,aehlig/bazel,aehlig/bazel,safarmer/bazel,safarmer/bazel,ButterflyNetwork/bazel,dslomov/bazel-windows,meteorcloudy/bazel,ButterflyNetwork/bazel,katre/bazel,bazelbuild/bazel,werkt/bazel,davidzchen/bazel,ulfjack/bazel,dslomov/bazel-windows,katre/bazel,dropbox/bazel,bazelbuild/bazel,meteorcloudy/bazel,twitter-forks/bazel,cushon/bazel,werkt/bazel,dslomov/bazel,dslomov/bazel-windows,twitter-forks/bazel,dropbox/bazel,perezd/bazel,ButterflyNetwork/bazel,katre/bazel,dropbox/bazel,safarmer/bazel