fix: natural order of parameters

 Issues smallrye#2092 and smallrye#1957.

Fixes the natural ordering inconsistency when the @parameters annotation is not used. Method parameters and BeanParam were sorted in alphabetical order if they were not declared with @parameter within the @parameters annotation.

core/src/main/java/io/smallrye/openapi/runtime/scanner/spi/AbstractParameterProcessor.java

@@ -110,7 +110,7 @@ public abstract class AbstractParameterProcessor {
     protected Map<String, Map<String, AnnotationInstance>> matrixParams = new LinkedHashMap<>();
 
     private Set<String> processedMatrixSegments = new HashSet<>();
-    private List<Parameter> preferredOrder;
+    private List<Parameter> preferredOrder = new ArrayList<>();
 
     /**
      * Used for collecting and merging any scanned {@link Parameter} annotations
@@ -234,6 +234,7 @@ protected void reset() {
         params.clear();
         formParams.clear();
         matrixParams.clear();
+        preferredOrder.clear();
     }
 
     protected ResourceParameters process(ClassInfo resourceClass, MethodInfo resourceMethod) {
@@ -1373,6 +1374,10 @@ protected void readParameter(ParameterContextKey key,
         }
 
         if (preferredOrder != null) {
+            if (context.oaiParam == null && context.name != null) {
+                context.oaiParam = new ParameterImpl();
+                context.oaiParam.setName(context.name);
+            }
             preferredOrder.add(context.oaiParam);
         }
     }