feat: add overloaded methods for single-value input

Author: bevzzz

src/main/java/io/weaviate/client6/v1/api/collections/query/Target.java

@@ -278,22 +278,42 @@ static Target combine(List<String> query, CombinationMethod combinationMethod, S
     return combine(query, combinationMethod, vectorWeights);
   }
 
+  static Target sum(String query, String... targetVectors) {
+    return sum(List.of(query), targetVectors);
+  }
+
   static Target sum(List<String> query, String... targetVectors) {
     return combine(query, CombinationMethod.SUM, targetVectors);
   }
 
+  static Target min(String query, String... targetVectors) {
+    return min(List.of(query), targetVectors);
+  }
+
   static Target min(List<String> query, String... targetVectors) {
     return combine(query, CombinationMethod.MIN, targetVectors);
   }
 
+  static Target average(String query, String... targetVectors) {
+    return average(List.of(query), targetVectors);
+  }
+
   static Target average(List<String> query, String... targetVectors) {
     return combine(query, CombinationMethod.AVERAGE, targetVectors);
   }
 
+  static Target relativeScore(String query, VectorWeight... weights) {
+    return relativeScore(List.of(query), weights);
+  }
+
   static Target relativeScore(List<String> query, VectorWeight... weights) {
     return combine(query, CombinationMethod.RELATIVE_SCORE, weights);
   }
 
+  static Target manualWeights(String query, VectorWeight... weights) {
+    return manualWeights(List.of(query), weights);
+  }
+
   static Target manualWeights(List<String> query, VectorWeight... weights) {
     return combine(query, CombinationMethod.MANUAL_WEIGHTS, weights);
   }

src/test/java/io/weaviate/client6/v1/api/collections/query/TargetTest.java

@@ -1,7 +1,5 @@
 package io.weaviate.client6.v1.api.collections.query;
 
-import java.util.List;
-
 import org.assertj.core.api.Assertions;
 import org.junit.Test;
 import org.junit.runner.RunWith;
@@ -68,7 +66,7 @@ public static Object[][] appendTargetsTestCases() {
         },
         {
             Target.min(
-                List.of("day", "night"),
+                "in the summertime",
                 "title_vec", "body_vec"),
             """
                 {
@@ -80,7 +78,7 @@ public static Object[][] appendTargetsTestCases() {
         },
         {
             Target.relativeScore(
-                List.of("one", "two", "three"),
+                "one and two and three and four",
                 Target.weight("title_vec", 2),
                 Target.weight("body_vec", 3)),
             """