[types] Add missing constructors

lib/index.d.ts

@@ -923,7 +923,7 @@ declare module "react-native-firebase" {
         unsubscribeFromTopic(topic: string): void
       }
 
-      interface RemoteMessage {
+      class RemoteMessage {
         collapseKey?: string
         data: Object
         from?: string
@@ -933,6 +933,8 @@ declare module "react-native-firebase" {
         to?: string
         ttl?: number
 
+        constructor();
+
         setCollapseKey(collapseKey: string): RemoteMessage
         setData(data: Object): RemoteMessage
         setMessageId(messageId: string): RemoteMessage
@@ -1016,6 +1018,8 @@ declare module "react-native-firebase" {
         subtitle?: string
         title: string
 
+        constructor();
+
         setBody(body: string): Notification
         setData(data: any): Notification
         setNotificationId(notificationId: string): Notification
@@ -1400,13 +1404,15 @@ declare module "react-native-firebase" {
         onLink(listener: (url: string) => void): () => void;
       }
 
-      interface DynamicLink {
+      class DynamicLink {
         analytics: AnalyticsParameters
         android: AndroidParameters
         ios: IOSParameters
         itunes: ITunesParameters
         navigation: NavigationParameters
         social: SocialParameters
+
+        constructor(link: string, dynamicLinkDomain: string);
       }
 
       interface AnalyticsParameters {