chat_in_terminal improvements: show function call args, word wrap, etc

[zhudotexe]

We should add kwargs to chat_in_terminal to:

• [x] Show the arguments passed to a function call (maybe a "verbose" arg) in the terminal
  • maybe worth showing the function's return value too? or allow the user to specify their formatter as a kwarg
• [x] Add a width kwarg to control the maximum width of a printed turn - mainly for envs like Jupyter that don't automatically line wrap
  • maybe default to detected terminal width?
• [x] Add echo kwarg to echo the user's input to stdout
• [x] Add kwarg to select which turn to start on (user/ai)