[ios] add `enableCache` prop support

ios/RNCWKWebView.h

 @property (nonatomic, assign) BOOL hideKeyboardAccessoryView;
 @property (nonatomic, assign) BOOL allowsBackForwardNavigationGestures;
 @property (nonatomic, copy) NSString *userAgent;
+@property (nonatomic, assign) BOOL enableCache;
 
 - (void)postMessage:(NSString *)message;
 - (void)injectJavaScript:(NSString *)script;

ios/RNCWKWebView.m

     };
 
     WKWebViewConfiguration *wkWebViewConfig = [WKWebViewConfiguration new];
+    if (_enableCache) {
+      wkWebViewConfig.websiteDataStore = [WKWebsiteDataStore defaultDataStore];
+    }
     wkWebViewConfig.userContentController = [WKUserContentController new];
     [wkWebViewConfig.userContentController addScriptMessageHandler: self name: MessageHanderName];
     wkWebViewConfig.allowsInlineMediaPlayback = _allowsInlineMediaPlayback;

ios/RNCWKWebViewManager.m

 RCT_EXPORT_VIEW_PROPERTY(hideKeyboardAccessoryView, BOOL)
 RCT_EXPORT_VIEW_PROPERTY(allowsBackForwardNavigationGestures, BOOL)
 RCT_EXPORT_VIEW_PROPERTY(userAgent, NSString)
+RCT_EXPORT_VIEW_PROPERTY(enableCache, BOOL)
 
 /**
  * Expose methods to enable messaging the webview.