Add references to modules I am responsible for (#3291)

Author: rhettinger

.github/CODEOWNERS

@@ -40,3 +40,12 @@ Python/bootstrap_hash.c       @python/crypto-team
 # Windows installer packages
 /Tools/msi/                   @python/windows-team
 /Tools/nuget/                 @python/windows-team
+
+**/*itertools*                @rhettinger
+**/*collections*              @rhettinger
+**/*random*                   @rhettinger
+**/*queue*                    @rhettinger
+**/*bisect*                   @rhettinger
+**/*heapq*                    @rhettinger
+**/*functools*                @ncoghlan @rhettinger
+**/*decimal*                  @rhettinger @skrah