Add Ability to use isSet when Array is uniqueItems (#6773)

Author: cerupcat

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/Swift5ClientCodegen.java

@@ -517,10 +517,10 @@ public String apiFileFolder() {
 
     @Override
     public String getTypeDeclaration(Schema p) {
-        if (ModelUtils.isArraySchema(p)) {
+    	if (ModelUtils.isArraySchema(p)) {
             ArraySchema ap = (ArraySchema) p;
             Schema inner = ap.getItems();
-            return "[" + getTypeDeclaration(inner) + "]";
+            return ModelUtils.isSet(p) ? "Set<" + getTypeDeclaration(inner) + ">" : "[" + getTypeDeclaration(inner) + "]";
         } else if (ModelUtils.isMapSchema(p)) {
             Schema inner = getAdditionalProperties(p);
             return "[String:" + getTypeDeclaration(inner) + "]";
@@ -634,12 +634,12 @@ public String toDefaultValue(Schema p) {
 
     @Override
     public String toInstantiationType(Schema p) {
-        if (ModelUtils.isMapSchema(p)) {
+    	if (ModelUtils.isMapSchema(p)) {
             return getSchemaType(getAdditionalProperties(p));
         } else if (ModelUtils.isArraySchema(p)) {
             ArraySchema ap = (ArraySchema) p;
             String inner = getSchemaType(ap.getItems());
-            return "[" + inner + "]";
+            return ModelUtils.isSet(p) ? "Set<" + inner + ">" : "[" + inner + "]";
         }
         return null;
     }