Add duration record for station connectivity graph

[CodeBear801]

Issue

• Targeting issue: the issue will be CLOSED once the PR merged. If there is no issue that addresses the problem, please open a corresponding issue and link it here. Uses the Closes keyword to close them automatically.
  Closes # 326

Description

Target:
Adjust spatialindexer/interface.go, record duration into pre-processed data. Originally, I thought only Distance is needed, which is right when ranking stations, but while building graph of charge stations, we need both Duration and Distance

// RankedPointInfo used to record ranking result to center point
// Distance record distance from center point to current point
// Duration records duration from center point to current point
type RankedPointInfo struct {
	PointInfo
	Distance float64
         // todo
        Duration float64
}

Modifications

• Record Duration during ranker's calculation
  • If use OSRM, record Duration from table response
  • If use great circle distance, use length/default speed for Duration
• Record Duration in pre-processing
  • When connectivity_map build data for charge station connectivity, record Duration with Distance
• Provide Duration in RankedPointInfo interface during the implementation of StationConnectivityQuerier

Tasklist

• CHANGELOG-FORK.md entry (CHANGELOG)
• profiles/CHANGELOG.md entry if any Lua changes
• update relevant Wiki pages
• add tests (see testing documentation