feature: send pedometer data from frontend

[AkashK321]

[AkashK321]

Request format that the backend is now expecting:

data class LiveNavigationRequest(
val session_id: String,
val request_id: String,
val timestamp_ms: Long,
val image_base64: String,
val focal_length_pixels: Double,
val heading_degrees: Double,
val distance_traveled: Double,
val gps: Map<String, Double>
)

key change: no more accelerometer data -> replaced with distance_traveled