[core] metadata is Record

src/structures/sessions.dto.ts

@@ -150,7 +150,7 @@ export class SessionConfig {
   })
   @IsDynamicObject()
   @IsOptional()
-  metadata?: Map<string, string>;
+  metadata?: Record<string, string>;
 
   @ApiProperty({
     example: null,

src/structures/webhooks.dto.ts

@@ -153,7 +153,7 @@ export class WAHAWebhook<Payload = any> {
     },
     description: 'Metadata for the session.',
   })
-  metadata?: Map<string, string>;
+  metadata?: Record<string, string>;
 
   @ApiProperty({
     example: WAHAEngine.WEBJS,