Bug: Export PreparedMessage class

[AlejoLovallo]

Describe the bug

When building a prepare message function, the return type for function prepareMessage inside the Conversation object is PreparedMessage, though It is not possible to type the return type because It is not exported from the SDK.

Expected behavior

No response

Steps to reproduce the bug

  public async prepareMessageToSend(
    conversation: Conversation,
    message: string,
    options?: SendOptions,
  ): Promise<PreparedMessage> 

[rygine]

the V2 JS SDK is being deprecated soon and is in maintenance mode. no new features / enhancements are being developed.