feat: add support for keepPreviousData & examples regarding this

packages/fl_query_hooks/lib/src/use_query.dart

@@ -1,3 +1,5 @@
+// ignore_for_file: invalid_use_of_protected_member
+
 import 'package:fl_query/fl_query.dart';
 import 'package:fl_query_hooks/src/utils.dart';
 import 'package:flutter/widgets.dart';
@@ -31,10 +33,11 @@ Query<T, Outside> useQuery<T extends Object, Outside>({
   final oldOnData = usePrevious(onData);
   final oldOnError = usePrevious(onError);
 
-  final init = useCallback(() {
+  final init = useCallback(([T? previousData]) {
     query.value = queryBowl.addQuery<T, Outside>(
       job,
       externalData: externalData,
+      previousData: previousData,
       key: uKey,
       onData: onData,
       onError: onError,
@@ -66,7 +69,17 @@ Query<T, Outside> useQuery<T extends Object, Outside>({
     final hasOnDataChanged = oldOnData != onData && oldOnData != null;
     if (oldJob != null && oldJob.queryKey != job.queryKey) {
       disposeQuery();
-      init();
+
+      /// setting the new query's initial data as prev query's data
+      /// when [job.keepPreviousData] is true and both are dynamic
+      if (oldJob.isDynamic &&
+          job.isDynamic &&
+          oldJob.keepPreviousData == true &&
+          job.keepPreviousData == true) {
+        init(query.value.data);
+      } else {
+        init();
+      }
     } else if (oldExternalData != null &&
         externalData != null &&
         !isShallowEqual(oldExternalData, externalData)) {