refactor: make featureExtractor Bean Nullable in getKeyValueTemplate Bean definition

Author: bsbodden

redis-om-spring/src/main/java/com/redis/om/spring/RedisModulesConfiguration.java

@@ -299,7 +299,7 @@ public CustomRedisKeyValueTemplate getKeyValueTemplate( //
       RedisModulesOperations<?> redisModulesOperations, //
       RedisMappingContext mappingContext, //
       RediSearchIndexer indexer, //
-      FeatureExtractor featureExtractor
+      @Nullable @Qualifier("featureExtractor") FeatureExtractor featureExtractor
   ) {
     return new CustomRedisKeyValueTemplate(
         new RedisEnhancedKeyValueAdapter(redisOps, redisModulesOperations, mappingContext, indexer, featureExtractor), //