143 feature create a simple motion planning node

[JuliusMiller]

Description

This PR adds a simple motion planning component.

Fixes #143

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

• motion_planning.py
• motion_planning.md
• intersection.py
• lane_change.py

Checklist:

• [x] My code follows the style guidelines of this project
• [x] 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
• [x] 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)

[github-actions[bot]]

Simulation results

Metric	Value
Avg. driving score	0.015622
Avg. route completion	0.14
Avg. infraction penalty	0.276933
Collisions with pedestrians	0.0
Collisions with vehicles	105.642
Collisions with layout	211.284
Red lights infractions	0.0
Stop sign infractions	0.0
Off-road infractions	0
Route deviations	0.0
Route timeouts	52.821
Agent blocked	52.821
Yield emergency vehicles infractions	0.0
Scenario timeouts	52.821
Min speed infractions	0.0