In #8946 I set up a module so we can add our custom lint checks. Adding one where we check licenses could save us some review time and prevent missed licenses.

It looks like we could do something like this to check the comments in a file: https://android.googlesource.com/platform/tools/base/+/studio-master-dev/lint/libs/lint-checks/src/main/java/com/android/tools/lint/checks/CommentDetector.java

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