@souceloop/chat-service file-uploading & downloading should be part of chat-service

[vaibhavkumar-sf]

File-uploading & downloading should be part of chat-service because it is very common in chat, make sure only authenticated & authorised chat-users can download attachment so that we can log who downloaded it,

Describe the solution you'd like Same is implemented in chat of Rakut*n project, contact 'Rashi Sharma' for the demo of it, most of the code can be used from there.