fix: null exception when no options used (#681)

Signed-off-by: Todd Baert <[email protected]>
Co-authored-by: Todd Baert <[email protected]>

Author: Kavindu-Dodan

providers/statsig/src/main/java/dev/openfeature/contrib/providers/statsig/StatsigProviderConfig.java

@@ -12,7 +12,8 @@
 @Builder
 public class StatsigProviderConfig {
 
-    private StatsigOptions options;
+    @Builder.Default
+    private StatsigOptions options = new StatsigOptions();
 
     // Only holding temporary for initialization
     private String sdkKey;