Implement base for RTP

api/src/main/java/com/alttd/essentia/EssentiaAPI.java

@@ -1,5 +1,6 @@
 package com.alttd.essentia;
 
+import com.alttd.essentia.api.model.randomteleport.LocationValidator;
 import org.jetbrains.annotations.ApiStatus;
 
 public interface EssentiaAPI {
@@ -19,4 +20,6 @@ public interface EssentiaAPI {
             Provider.instance = instance;
         }
     }
+
+    public void addLocationValidator(LocationValidator locationValidator);
 }

api/src/main/java/com/alttd/essentia/api/model/randomteleport/LocationValidator.java

@@ -0,0 +1,8 @@
+package com.alttd.essentia.api.model.randomteleport;
+
+import org.bukkit.Location;
+
+public interface LocationValidator {
+
+    boolean validate(Location location);
+}