[FEAT] Add dashboard metric endpoints

[rv2931]

METRICS ENDPOINTS

global

• /metrics/vessels-in-activity/total/{start_at/{end_at}
• /metrics/zone-visited/total/{start_at/{end_at}metrics

metrics

• /zones/{zone_id}/{zone_types}/visit?limit=N&orderBy=ASC/DESC > renvoie le visiting time pour les top N vessels dans touts les zones/la zone_id
• /vessels/{vessel_id}/{visit_types|all}/visit?limit=N&orderBy=ASC/DESC > renvoie le visiting time pour les top N zones pour tous les vessel/le vessel_id
• ADD temporal filters (start_at, end_at) as Timestamps (start/end included ? GMT+0 ?)
• define what is the "most visited" criteria