refactor: rename method to follow naming conventions

Author: bevzzz

src/main/java/io/weaviate/client/v1/async/schema/api/VectorAdder.java

@@ -35,7 +35,7 @@ public VectorAdder(CloseableHttpAsyncClient client, Config config, AccessTokenPr
     this.getter = new ClassGetter(client, config, tokenProvider);
   }
 
-  public VectorAdder withClass(String className) {
+  public VectorAdder withClassName(String className) {
     this.className = className;
     return this;
   }

src/main/java/io/weaviate/client/v1/schema/api/VectorAdder.java

@@ -25,7 +25,7 @@ public VectorAdder(HttpClient httpClient, Config config) {
     this.getter = new ClassGetter(httpClient, config);
   }
 
-  public VectorAdder withClass(String className) {
+  public VectorAdder withClassName(String className) {
     this.className = className;
     return this;
   }

src/test/java/io/weaviate/integration/client/async/schema/ClientSchemaTest.java

@@ -299,7 +299,7 @@ public void cancelled() {
         }
       };
       Result<Boolean> add = client.schema().vectorAdder()
-          .withClass(className)
+          .withClassName(className)
           .withVectorConfig("vector-a", vector)
           .withVectorConfig("vector-b", vector)
           .run(callback).get();

src/test/java/io/weaviate/integration/client/schema/ClientSchemaTest.java

@@ -176,7 +176,7 @@ public void testSchemaAddVectors() {
 
     // Act
     Result<Boolean> add = client.schema().vectorAdder()
-        .withClass(className)
+        .withClassName(className)
         .withVectorConfig("vector-a", vector)
         .withVectorConfig("vector-b", vector)
         .run();