Docs: Add tutorial on how to start/pause simulator from CLI

[Ryanf55]

Desired behavior

Add a new tutorial similar to reset that shows how to start/stop. Context: https://discord.com/channels/1077825543698927656/1080763334384697430/1232059825634934875

Alternatives considered

N/A

Implementation suggestion

• Show start/pause button in GUI and what it does
• Explain how sim time stops and how to check sim time and iterations in CLI
• Explain how to start/pause with the gz CLI through transport
• Add a demo video

gz sim -s shapes.sdf
gz service -s /world/shapes/control --reqtype gz.msgs.WorldControl --reptype gz.msgs.Boolean --timeout 3000 --req 'pause: false'
gz topic -e -t /stats -n 1
sim_time {
  sec: 2
  nsec: 807000000
}
real_time {
  sec: 2
  nsec: 824597858
}
iterations: 2807
real_time_factor: 0.99667211181863757
step_size {
  nsec: 1000000
}

Additional context

Please assign this to me. I'll write the tutorial.