[MISC] Add a stop rendering && reset function

[JonnyDing]

trafficstars

Description:

This PR introduces two new key controls:

• Pressing Space toggles the rendering on/off.
• Pressing X resets the scene.

These enhancements improve usability and streamline interaction with the scene.

Testing:

• Verified that Space successfully starts/stops rendering.
• Confirmed that X resets the scene to its initial state.

example

• Go2 env success
• Gr1t1 env success

[JonnyDing]

why alway black format error /流汗

[ziyanx02]

Check CONTRIBUTING.md for black format check