Implement basic syncing client

[oubiwann]

Tasks:

• Do some actix reading
• Find a good place in rucksack for the code
• Stub out a basic client implementation
• Add some subcommands to the CLI to make a basic client call to a running server
• Update the command docstrings

[oubiwann]

• https://mainmatter.com/blog/2018/06/27/actix-tcp-client/
• https://github.com/actix/examples/blob/master/websockets/chat-tcp/src/session.rs