[yt] build async_shell.rs ex from r3bl_terminal_async crate

[nazmulidris]

Live coding video "Build your own async REPL or shell in Rust"

• Based on the shell_async.rs ex, create a video showcasing how this entire example can be built from scratch

• Notes

  • Make it clear that this is not blocking, not sync
  • The readline is async, the stdout is async and can be paused using spinner, etc
  • Make it clear that there's a managed bash child process that is used to actually execute the input from the REPL / shell program
  • The main program is built using the r3bl_terminal_async crate, so provide some background info on how this is put together and what it does

• Add this to the TTY playlist