remove TODOs

They don't make sense anymore.
E.g. the Tags class is used by classes outside of
org.lucares.performance.db.

pdb-api/src/main/java/org/lucares/pdb/api/Tags.java

@@ -10,8 +10,6 @@ import java.util.TreeSet;
 import java.util.function.BiConsumer;
 
 public class Tags {
-	// TODO @ahr move class to org.lcuares.performance.db and make this package
-	// private
 	public static final Tags EMPTY = new Tags();
 
 	private final Map<String, Tag> tags;