Feat: Add Communication Service for users in room

[Josephaedan]

Changes to existing process flow:

• "Create Room": Frontend creates a room in Collaboration service (as before), but now uses the generated roomId to generate a new room in Communication Service
• "Join Room": Matching Service creates a room in Collaboration service (as before), but now uses the generated roomId to generate a new room in Communication Service too

Changes to API Gateway

• Add communication service to secrets
• Add proxy for /communication to Communcation Service

Changes to docker-compose.yaml

• Add communication service as new docker service at port 8006

Changes to Matching Service

• Creates room in communication service after creating room from Collaboration service (still need to clean up string literals sorry @joelwongjy)

Communication Service

• Socket generates rooms with roomId equal to the room generated from Collaboration service. This is called from the Frontend in 'Create Room' or from Matching Service in 'Join a Room'
• Upon entering a room, users will establish a connection with the server socket and fetch all previous messages
• When user sends a message, a socket event is fired which will make all users in the room receive the new message (including the sender). I chose this way as it allows for synchronisation of the messages without updating optimistically on the sender's UI.

Frontend

Changes to Existing Implementation

• Add popover theme in Chakra-ui theme
• Add new pulse animation in Chakra-ui theme
• Add an AlwaysScrollToBottom helper function for utils

New Implementation Decisions

• Add new useChatStore Zustand Store for storing and accessing messages in the chatroom. This is used because Zustand allows for components to access different parts of the state and also subscribe to specific states for things like detecting notifications and deleting the store upon changing rooms (and also because we need to justify having Zustand).
• Add new floating button for Chat function at the bottom right of the CodeEditor (in purple)

• Add new chatbox functionality popover upon clicking the Chat button with the existing chat messages

• Displays a notification for users whenever a new message is sent to the chatroom or when a user joins the room. This is triggered when messages are added while the user does not have chat opened

[raynerljm]

lgtm! just one thing, the FE has a missing dependency for @codemirror/collab. also can u help to update the root README.md with details about setting up the communication-service env vars + the fact that the comm service is on localhost:8006