chore: replace usages of boxed primitives where possible

Author: bevzzz

src/main/java/io/weaviate/client6/v1/api/collections/aggregate/GroupedBy.java

@@ -13,12 +13,12 @@ public String text() {
   }
 
   public boolean isInteger() {
-    return value instanceof String;
+    return value instanceof Long;
   }
 
-  public Integer integer() {
-    checkPropertyType(this::isInteger, "Integer");
-    return (Integer) value;
+  public Long integer() {
+    checkPropertyType(this::isInteger, "Long");
+    return (Long) value;
   }
 
   private void checkPropertyType(Supplier<Boolean> check, String expected) {

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

@@ -47,17 +47,17 @@ public static abstract class Builder<SELF extends Builder<SELF, T>, T extends Ob
     private List<QueryReference> returnReferences = new ArrayList<>();
     private List<Metadata> returnMetadata = new ArrayList<>();
 
-    public final SELF limit(Integer limit) {
+    public final SELF limit(int limit) {
       this.limit = limit;
       return (SELF) this;
     }
 
-    public final SELF offset(Integer offset) {
+    public final SELF offset(int offset) {
       this.offset = offset;
       return (SELF) this;
     }
 
-    public final SELF autocut(Integer autocut) {
+    public final SELF autocut(int autocut) {
       this.autocut = autocut;
       return (SELF) this;
     }