[FEATURE] update HoverEnv, change hyper params, and visualization while training

[KafuuChikai]

1. improve algo hyper params. In hover_train.py
   set "entropy_coef": 0.004,, for a better flight.

2. add visualization while training. For performance reason, the max render n env is set to 10.

   training.mp4

3. update readme for In the drone project，the hover_eval.py is extremely slow #530
   Note: If you experience slow performance or encounter other issues during evaluation, try removing the --record option.

[KafuuChikai]

After this demo, I plan to continue updating the GenesisDroneEnv repository. Future updates may include the addition of the latest features and the implementation of more complex functionalities to enhance the environment's capabilities and performance.

[KafuuChikai]

Hi @zhouxian ,

Just a friendly reminder about PR #533. Could you please review it when you have a moment?

Thank you!

Best,
Wang Xian

[zhouxian]

Pretty cool demo! :)