feat: add comprehensive player statistics logging

src/main/java/net/therosegarden/playerstats/StatsStorage.java

@@ -0,0 +1,23 @@
+package net.therosegarden.playerstats;
+
+import java.io.Closeable;
+import java.util.Collection;
+import java.util.UUID;
+
+interface StatsStorage extends Closeable {
+    PlayerRecord load(UUID uuid, String currentName) throws Exception;
+
+    void save(PlayerRecord record) throws Exception;
+
+    default void saveAll(Collection<PlayerRecord> records) throws Exception {
+        for (PlayerRecord record : records) {
+            save(record);
+        }
+    }
+
+    void journal(UUID uuid, String playerName, String eventType, String detail) throws Exception;
+
+    @Override
+    default void close() throws java.io.IOException {
+    }
+}