Integrate chat with back-end

[segeeslice]

Overview

This integrates the individual user chats (accessible via the Meet page) with the server.

This relies on this main repo PR being merged, especially due to breaking CSRF changes that were required from both ends for POST methods to work appropriately.

Other Important Notes

• To remain efficient, user chats are only loaded when the matched user's details are open
  • This ensures that having a lot of matches will not ridiculously slow down your system when retrieving matches
  • Pings the "Get messages" endpoint roughly every second to ensure we're up-to-date
• Calling "Get messages" so often may cause unnecessary slowness in the future
  • Reported to this main repo issue
  • Say the user has 10,000 messages, then we would load all 10,000 each second, possibly overworking the server
  • Could remedy this via:
    • Only returning most recent X messages at a time and lazy-loading as we scroll (industry-standard, but difficult)
    • Limiting the number of total messages two users can have (easy, but could restrict user experience)

Issues

• Made #29 visible
• Made this main repo issue visible
• Closes #26