Redo hwid bans - reduce amount of db queries on login

Works by loading all hwid bans on startup and querying the collection in memory
rather than making calls on every login.

src/main/java/server/ban/HwidBanManager.java

@@ -0,0 +1,49 @@
+package server.ban;
+
+import database.ban.HwidBan;
+import database.ban.HwidBanRepository;
+import lombok.extern.slf4j.Slf4j;
+import net.jcip.annotations.ThreadSafe;
+import net.server.coordinator.session.Hwid;
+
+import java.util.HashSet;
+import java.util.List;
+import java.util.Objects;
+import java.util.Set;
+
+/**
+ * @author Ponk
+ */
+@ThreadSafe
+@Slf4j
+public class HwidBanManager {
+    private final HwidBanRepository hwidBanRepository;
+    private final Set<Hwid> bannedHwids = new HashSet<>();
+
+    public HwidBanManager(HwidBanRepository hwidBanRepository) {
+        this.hwidBanRepository = hwidBanRepository;
+    }
+
+    public synchronized void loadHwidBans() {
+        List<HwidBan> hwidBans = hwidBanRepository.getAllHwidBans();
+        log.debug("Loaded {} hwid bans", hwidBans.size());
+        bannedHwids.addAll(hwidBans.stream()
+                .map(HwidBanManager::createHwid)
+                .filter(Objects::nonNull)
+                .toList()
+        );
+    }
+
+    private static Hwid createHwid(HwidBan hwidBan) {
+        try {
+            return new Hwid(hwidBan.hwid());
+        } catch (IllegalArgumentException e) {
+            log.warn("Unable to create Hwid from: {} due to bad 'hwid' value in database", hwidBan);
+            return null;
+        }
+    }
+
+    public synchronized boolean isBanned(Hwid hwid) {
+        return bannedHwids.contains(hwid);
+    }
+}