feat: add go client

[xovbd]

Description:

This PR introduces the Go client for the connect4 game, which is designed to
interact with the game server.

Changes:

• Go Client Implementation:

  • The Go client connects to the game server via WebSocket, requests the acutal
    game states and send the column number where to insert the next coin.
  • It supports bot selection via command-line flags, allowing users to choose
    between different bots (e.g. RandomBot, MyBot).

• Bot Implementation:

  • The bot implements logic for returning a column number where to insert the
    next coin.
  • It supports multiple types of bots, including an example bot and a template
    for creating custom bots.
  • The bot types can be extended easily using the provided BotFactory.

• Configuration:

  • Command-line flags allow users to configure the bot behavior and specify
    server details (bot tu use and server port number).
  • New bots can be created by copying and modifying the provided mybot.go
    file.

• Project Structure:

  • The project structure follows a clean separation of concerns with clear
    directories for cmd, internal and model.

Installation & Usage:

• The project can be built using Go 1.23.5 or higher.
• Dependencies are handled via Go modules.
• The bot is configured via command-line flags, including options for the port
  and bot type.

Example Usage:

# Build the bot
go build -o connect4 cmd/main.go

# Run the bot
./connect4-bot --port 8765 --bot RandomBot

Testing:

• The bot has been tested with the game server to ensure it can connect and
  respond correctly.