#3674 Add @nullable to Query getId(), getForUpdateLockWait(), getForUpdateLockType() (#3675)

These methods return nullable results, add JSpecify `@Nullable` to correctly indicate this.

Author: rbygrave

ebean-api/src/main/java/io/ebean/Query.java

@@ -1,6 +1,7 @@
 package io.ebean;
 
 import org.jspecify.annotations.NullMarked;
+import org.jspecify.annotations.Nullable;
 
 /**
  * Object relational query for finding a List, Set, Map or single entity bean.
@@ -310,6 +311,7 @@ enum LockWait {
   /**
    * Return the Id value.
    */
+  @Nullable
   Object getId();
 
   /**
@@ -446,11 +448,13 @@ enum LockWait {
   /**
    * Return the "for update" wait mode to use.
    */
+  @Nullable
   LockWait getForUpdateLockWait();
 
   /**
    * Return the lock type (strength) to use with "for update".
    */
+  @Nullable
   LockType getForUpdateLockType();
 
   /**