fix: chat implementation

[mohammeds1992]

Fixes Issue

Changes proposed

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• My code follows the code style of this project.
• My change requires changes to the documentation.
• I have updated the documentation accordingly.
• This PR does not contain plagiarized content.
• The title of my pull request is a short description of the requested changes.

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Note to reviewers

[github-actions]

In file packages/restapi/src/lib/pushapi/chat.ts:

1. In the history method, there are missing closing brackets } after the if conditions for setting the reference variable.

2. In the message method, there is a missing opening bracket { after the declaration of the reference variable.

3. In the send method, there is a missing closing bracket } after the throw new Error statement.

4. The listType variable used inside the history and message methods is not defined. It should be defined before being used.

5. There is a missing return statement before return historyMessages.map((message: any) => ({ ...message, listType })); in the history method.

6. In the decrypt method, the parameters for PUSH_CHAT.decryptConversation seems to be incomplete as it's missing some arguments.

Please address the issues mentioned above to ensure the code functions correctly.

Let me know if you need further clarification or assistance with fixing the identified issues.