add fullfp command

src/main/java/emu/grasscutter/command/commands/FullHpCommand.java

+package emu.grasscutter.command.commands;
+
+import emu.grasscutter.command.Command;
+import emu.grasscutter.command.CommandHandler;
+import emu.grasscutter.game.GenshinPlayer;
+import emu.grasscutter.game.props.FightProperty;
+import emu.grasscutter.server.packet.send.PacketAvatarFightPropUpdateNotify;
+import emu.grasscutter.server.packet.send.PacketAvatarLifeStateChangeNotify;
+import emu.grasscutter.server.packet.send.PacketEntityFightPropUpdateNotify;
+import emu.grasscutter.server.packet.send.PacketLifeStateChangeNotify;
+
+import java.util.List;
+
+@Command(label = "fullhp", usage = "fullhp|fhp",
+        description = "Recover all characters in your current team to full health.", aliases = {"fhp"}, permission = "player.fullhp")
+public class FullHpCommand implements CommandHandler {
+    @Override
+    public void execute(GenshinPlayer sender, List<String> args) {
+        if (sender == null) {
+            CommandHandler.sendMessage(null, "Run this command in-game.");
+            return;
+        }
+        sender.getTeamManager().getActiveTeam().forEach(entity -> {
+            boolean isAlive = entity.isAlive();
+            entity.setFightProperty(
+                    FightProperty.FIGHT_PROP_CUR_HP,
+                    entity.getFightProperty(FightProperty.FIGHT_PROP_MAX_HP)
+            );
+            entity.getWorld().broadcastPacket(new PacketAvatarFightPropUpdateNotify(entity.getAvatar(), FightProperty.FIGHT_PROP_CUR_HP));
+            if (!isAlive) {
+                entity.getWorld().broadcastPacket(new PacketAvatarLifeStateChangeNotify(entity.getAvatar()));
+            }
+        });
+        CommandHandler.sendMessage(sender, "All hp recover to full.");
+    }
+}