Is your feature request related to a problem? Please describe.
We need to support the new protocol in order to support the new version

Describe the solution you'd like
Implement the new protocol specifications

Describe alternatives you've considered
N/A

Additional context
Network protocol

• The client-bound player_chat packet now contains an index increasing for every message sent to the client.
  • The index starts at 0 when logging in (or is reset by configuration phase and the login packet).
  • For every message, the server should increment this value by 1.
  • If this value updates in an unexpected way, the client will disconnect.
  • As the protocol requires that every chat packet reaches the client in produced order, the goal is to enable faster detection of missed/reordered chat messages for custom server developers.
• The server-bound chat and chat_command_signed packets now contain a checksum byte along with the 'last seen' update.
  • This is a simple hash of the 'last seen' signatures which should be reconstructed by the server, allowing quicker detection of de-synchronized state.
  • This can be passed as 0 to disable the check, for compatibility with protocol translation.