:twisted_rightwards_arrows: roughly tested most of the modules

[MotacillaAlba]

• add docs, headers, and test for most of the modules (except for participant interaction models)
• remove sample data of LevelX's datasets

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 78.07933% with 315 lines in your changes are missing coverage. Please review.

Project coverage is 83.37%. Comparing base (fceea8e) to head (019b6f6). Report is 2 commits behind head on master.

Files	Patch %	Lines
tactics2d/map/parser/parse_xodr.py	13.54%	134 Missing :warning:
tactics2d/map/parser/parse_osm.py	78.46%	70 Missing :warning:
tactics2d/envs/parking.py	90.57%	13 Missing :warning:
tactics2d/envs/racing.py	93.01%	13 Missing :warning:
tactics2d/traffic/event_detection/off_route.py	33.33%	12 Missing :warning:
tactics2d/dataset_parser/parse_nuplan.py	44.44%	10 Missing :warning:
tactics2d/sensor/render_manager.py	84.12%	10 Missing :warning:
tactics2d/traffic/event_detection/collision.py	66.66%	9 Missing :warning:
tactics2d/traffic/event_detection/no_action.py	67.85%	9 Missing :warning:
tactics2d/map/element/area.py	75.00%	6 Missing :warning:
... and 10 more

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #84 +/- ## ========================================== + Coverage 75.05% 83.37% +8.31% ========================================== Files 71 80 +9 Lines 4494 4955 +461 ========================================== + Hits 3373 4131 +758 + Misses 1121 824 -297 ```

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