Function pinMessage

pinMessage(client, params): Promise<Message | null>
Pin a message in a group, supergroup, channel or PM.

For supergroups/channels, you must have appropriate permissions, either as an admin, or as default permissions
Parameters
- client: ITelegramClient
- params: InputMessageId & {
      bothSides?: boolean;
      notify?: boolean;
      shouldDispatch?: true;
  }
Returns Promise<Message | null>
Service message about pinned message, if one was generated.
- Defined in packages/core/src/highlevel/methods/messages/pin-message.ts:16