feat: message forwarding

#10464 djs

typings/index.d.ts

@@ -2182,7 +2182,7 @@ export class Message<Cached extends boolean = boolean> extends Base {
   public call: MessageCall | null;
   public flags: Readonly<MessageFlags>;
   public reference: MessageReference | null;
-  public snapshots: Partial<Message<false>>[] | null;
+  public messageSnapshots: Collection<Snowflake, MessageSnapshot>;
   public position: number | null;
   public awaitReactions(options?: AwaitReactionsOptions): Promise<Collection<Snowflake | string, MessageReaction>>;
   public createReactionCollector(options?: ReactionCollectorOptions): ReactionCollector;
@@ -7138,6 +7138,26 @@ export interface MessageMentionOptions {
 
 export type MessageMentionTypes = 'roles' | 'users' | 'everyone';
 
+export interface MessageSnapshot
+  extends Partialize<
+    Message,
+    null,
+    Exclude<
+      keyof Message,
+      | 'attachments'
+      | 'client'
+      | 'components'
+      | 'content'
+      | 'createdTimestamp'
+      | 'editedTimestamp'
+      | 'embeds'
+      | 'flags'
+      | 'mentions'
+      | 'stickers'
+      | 'type'
+    >
+  > {}
+
 export interface MessageOptions {
   activity?: MessageActivity;
   tts?: boolean;