Identifying exit numbers in roundabouts

Mapbox Navigation SDK version: 2.0.0-rc.2

https://hey.mapbox.com/directions-debug/#route=6.124388228364182,45.9055553186453;6.126108200540244,45.90652815414734&server=https://api.mapbox.com&profile=mapbox/driving-traffic&style=empty&queryparams=steps%3Dtrue%26overview%3Dfull%26geometries%3Dgeojson%26roundabout_exits%3Dtrue%26voice_units%3Dimperial%26voice_instructions%3Dtrue&token=pk.eyJ1Ijoic3ZjLW9rdGEtbWFwYm94LXN0YWZmLWFjY2VzcyIsImEiOiJja2d0bHMxbDcwNHI0MnRxbHBwNTBoeHN0In0.X5Gn0apaqXAXDkZ1sSDLfA

Directions API provides an exit number

              "maneuver": {
                "type": "roundabout",
                "exit": 3,
                "instruction": "Enter the roundabout and take the 3rd exit onto Avenue de Brogny/D 1201.",
                "modifier": "slight right",
                "bearing_after": 123,
                "bearing_before": 94,
                "location": [
                  6.125695,
                  45.90563
                ]
              },

But I can't find this exit number from the navigation-ui Maneuver api. It seems like it should be near the "degrees"

Here's the definition we're looking to satisfy for Android Auto from their Manevuer.setRoundaboutExitNumber

For example, if the driver is joining a counter-clockwise roundabout with 4 exits,
then the exit to the right would be exit #1, the one straight ahead would be exit #2,
the one to the left would be exit #3 and the one used by the driver to join the
roundabout would be exit #4.

cc: @cafesilencio @abhishek1508 @Guardiola31337

Bắt đầu với dữ liệu thao tác tại vòng xuyến từ Directions API và định nghĩa PrimaryManeuver.kt được liên kết trong issue. Theo dõi cách các trường của thao tác đến navigation-ui Maneuver API, sau đó cung cấp số lối ra của vòng xuyến bằng định nghĩa Android Auto Maneuver.setRoundaboutExitNumber; hoàn thành khi số lối ra được yêu cầu khả dụng cho tuyến đường này.