[Compiler PSI] Make getContextReceivers default to preserve compatibility

^KT-51747 Fixed

Author: petukhovv

compiler/psi/src/org/jetbrains/kotlin/psi/KtCallableDeclaration.java

@@ -20,6 +20,7 @@
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
+import java.util.Collections;
 import java.util.List;
 
 public interface KtCallableDeclaration extends KtNamedDeclaration, KtTypeParameterListOwner {
@@ -33,7 +34,9 @@ public interface KtCallableDeclaration extends KtNamedDeclaration, KtTypeParamet
     KtTypeReference getReceiverTypeReference();
 
     @NotNull
-    List<KtContextReceiver> getContextReceivers();
+    default List<KtContextReceiver> getContextReceivers() {
+        return Collections.emptyList();
+    }
 
     @Nullable
     KtTypeReference getTypeReference();