Add some thread checking helper methods

pending PaperMC/Folia#5 for global region helpers

providers/BaseProviders/src/main/java/net/ess3/provider/SchedulingProvider.java

@@ -6,6 +6,10 @@ import org.bukkit.entity.Entity;
 public interface SchedulingProvider extends Provider {
     void registerInitTask(Runnable runnable);
 
+    boolean isEntityThread(Entity entity);
+
+    boolean isRegionThread(Location location);
+
     void runEntityTask(Entity entity, Runnable runnable);
 
     EssentialsTask runEntityTask(Entity entity, Runnable runnable, long delay);

providers/BaseProviders/src/main/java/net/ess3/provider/providers/BukkitSchedulingProvider.java

@@ -18,6 +18,16 @@ public class BukkitSchedulingProvider implements SchedulingProvider {
         plugin.getServer().getScheduler().scheduleSyncDelayedTask(plugin, runnable);
     }
 
+    @Override
+    public boolean isEntityThread(Entity entity) {
+        return plugin.getServer().isPrimaryThread();
+    }
+
+    @Override
+    public boolean isRegionThread(Location location) {
+        return plugin.getServer().isPrimaryThread();
+    }
+
     @Override
     public void runEntityTask(Entity entity, Runnable runnable) {
         runEntityTask(entity, runnable, 1);

providers/FoliaProvider/src/main/java/net/ess3/provider/providers/FoliaSchedulingProvider.java

@@ -38,6 +38,16 @@ public class FoliaSchedulingProvider implements SchedulingProvider, Listener {
         initTasks.add(runnable);
     }
 
+    @Override
+    public boolean isEntityThread(Entity entity) {
+        return plugin.getServer().isOwnedByCurrentRegion(entity);
+    }
+
+    @Override
+    public boolean isRegionThread(Location location) {
+        return plugin.getServer().isOwnedByCurrentRegion(location);
+    }
+
     @Override
     public void runEntityTask(Entity entity, Runnable runnable) {
         runEntityTask(entity, runnable, 1);