218 feature implement node for traffic light detection

[MarcoRiedenauer]

Description

This PR introduces a node for traffic light detection. Traffic lights detected by EfficientPs are snipped out of the image and classified.

Fixes # (issue)

Time invested

8h Marco

Type of change

Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality)

Does this PR introduce a breaking change?

No

Most important changes

Most important changes in TLDNode.py and perception.launch

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works (might be obsolete with CI later on)
• New and existing unit tests pass locally with my changes (might be obsolete with CI later on)