dora_gemini_diff_drive_nav: Improve control using past commands

[francocipollone]

Summary

Investigate how to improve navigation introduced at #38

The model could also receive:

• Past controls (with the times)
• Past images (this could be a bit heavy)

Def of Done

• Feedback the past controls and past images into the model
• Provide an env var to the node to enable / disable this feedback.