fix: allow groupImage and groupDesc to be updated to null

[Aman035]

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

1. In the latest method, there is a missing closing curly brace } after defining threadHash and intent variables.
2. In the history method, there is a missing closing curly brace } after setting the value of reference.
3. In the update method, there is a missing closing curly brace } after the group not found error is thrown.
4. In the update method, the updateGroupProfile and updateGroupConfig functions should be prefixed with await as they are asynchronous functions.

In the file packages/restapi/src/lib/pushapi/pushAPITypes.ts:

1. In the GroupCreationOptions interface, the rules property is missing a closing curly brace }.
2. In the RemoveFromGroupOptions interface, the role property should be of type 'ADMIN' | 'MEMBER' but it's missing in the code snippet provided.
3. In the GetGroupParticipantsOptions interface, the role property should be of type 'ADMIN' | 'MEMBER' but it's defined as string.
4. In the VideoInitializeOptions interface, the media property is defined outside the config object.

In the file packages/restapi/tests/lib/chat/chat.group.test.ts:

1. In the test case for updating a group, there are missing closing curly braces } for the it blocks after setting updatedGroup as private and updating group description and image as null.

In the file packages/restapi/tests/lib/chat/chat.test.ts:

1. In the test case for sending a message in readOnly mode, the let errorCaught variable is not properly initialized and should be moved inside the try block.
2. In the test case for decrypting a message, the userBob.chat.decrypt function should be awaited as it returns a promise.

Overall, the code requires some corrections and missing parts to be added for correct execution.

Let me know if you need further assistance with fixing these issues.