feat: add send file function

src/client/whatsapp.ts

@@ -1,6 +1,7 @@
 import type {
   GetMessagesParams,
   ListChatsParams,
+  SendFileParams,
   SendTextParams,
 } from "../shared/protocol";
 import type {
@@ -158,6 +159,10 @@ export class WhatsAppClient {
     return this.request<any>("sendText", params);
   }
 
+  sendFile(params: SendFileParams) {
+    return this.request<any>("sendFile", params);
+  }
+
   getMedia(msgId: string) {
     return this.request<string>("getMedia", msgId);
   }