Extracting semantic tags, road and lane types & speed limits

[aprabou]

Description

This extension allows for the extraction of semantic tags and speed limits/types from roads and lanes.
The changes are made to the following files:

roads.py:

• added distributionFunction speedLimitAt to get the speed limit at coordinate-s along a given range
• speedLimit element depreciated

xodr_parser.py:

• Speed parsing/among helpers:

  • speed_to_mps
  • speed_limit_ranges_from_type_records
  • speed_limit_ranges_from_lane_records
  • effective_speed_limit_ranges
  • speed_limit_for_s_interval
  • assign_speed_limit_from_ranges.

• When an interval straddles multiple limits, the minimum is used and an OpenDriveWarning is emitted.

• Tag helpers:

  • merge_scenic_tags
  • lane_scenic_tags
  • _junction_tags
  • assign_semantic_tags

• Propagation helpers:

  • propagate_speed_limit
  • apply_lane_speed_limits
  • propagate_tags

• Road, Lane, and Junction now capture:

  • type_records
  • lane speed_records
  • junction type_
  • extra_tags

• Road.toScenicRoad wires per-section and per-lane speed limits and tags into the Scenic objects.

• Expanded drivable_lane_types / sidewalk_lane_types / shoulder_lane_types defaults (e.g. slipLane, biking, walking, restricted, curb, none; parking classified as a shoulder).

test_opendrive.py:

• New unit tests covering speed-unit conversion, road/lane speed-range parsing, per-section and per-lane effective limits, multi-limit warnings, and tag propagation

Checklist

• I have tested the changes locally via pytest and/or other means
• I have added or updated relevant documentation
• I have autoformatted the code with black and isort
• I have added test cases (if applicable)