[BUG] Response class not updated as per API

[danishjamal104]

Describe the bug
With the updated API, the response now contains a separate error field, but the app is still using the older version.

To Reproduce
Steps to reproduce the behavior:

1. Go to com.github.code.gambit.data.remote.responses package
2. See Response.kt and ListResponse.kt class files
3. Scroll down to '....'

Expected behavior
A clear and concise description of what you expected to happen.

Device Information:

• Device: ANY
• Version: ANY

Additional context
Also, the error and body fields would be nullable as both can't be null simultaneously.

Would you like to work on this issue

• Yes
• No