With this file, GitHub can automatically assign reviewers for pull requests
containing files in component subdirectories.

This is a step towards enabling external contributors to be maintainers of components in Bazel.

For more information: https://help.github.com/articles/about-codeowners/

GitHub blog post: https://blog.github.com/2017-07-06-introducing-code-owners/

RELNOTES: None.
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