feat(ad-api): add detect area

[tkhmy]

Description

• add document for detect area
• Create api for visualization autoware#3225 (comment)
• feat(autoware_adapi_v1_msgs): add detect area autoware_adapi_msgs#29

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[github-actions]

Documentation URL: https://autowarefoundation.github.io/autoware-documentation/pr-333/
Modified URLs:

• https://autowarefoundation.github.io/autoware-documentation/pr-333/design/autoware-interfaces/ad-api/list/api/planning/
• https://autowarefoundation.github.io/autoware-documentation/pr-333/design/autoware-interfaces/ad-api/list/api/planning/planning_areas/
• https://autowarefoundation.github.io/autoware-documentation/pr-333/design/autoware-interfaces/ad-api/types/autoware_adapi_v1_msgs/msg/planning_area/
• https://autowarefoundation.github.io/autoware-documentation/pr-333/design/autoware-interfaces/ad-api/types/autoware_adapi_v1_msgs/msg/planning_area_array/
• https://autowarefoundation.github.io/autoware-documentation/pr-333/design/autoware-interfaces/ad-api/types/autoware_adapi_v1_msgs/msg/shape/

[stale]

This pull request has been automatically marked as stale because it has not had recent activity.

[tkhmy]

@isamu-takagi cc: @yabuta @yuasabe
As this task is not going to develop by my side, so I will close this pr.