Adds bindings/rust API for BulbGroup abstraction.

[francocipollone]

🎉 New feature

Related to :

• https://github.com/maliput/maliput-rs/issues/95

• 100

• 103

• https://github.com/maliput/maliput-rs/issues/99
• https://github.com/maliput/maliput-rs/issues/96
• https://github.com/maliput/maliput-rs/issues/102

Summary

• Adds bindings for BulbGroup

• Adds rust API for BulbGroup

• Adds method for TrafficLights to get BulbGroups

• Adds method for Bulbs to get BulbGroup

• Tests are added.

Checklist

• [x] Signed all commits for DCO
• [x] Added tests
• [ ] Added example and/or tutorial
• [ ] Updated documentation (as needed)
• [ ] Updated migration guide (as needed)
• [ ] Consider updating Python bindings (if it affects the public API)