feat(protonvpn): feature filters (#2182)

- `SECURE_CORE_ONLY`
- `TOR_ONLY`
- `P2P_ONLY`

internal/storage/filter.go

@@ -79,6 +79,18 @@ func filterServer(server models.Server,
 		return true
 	}
 
+	if *selection.SecureCoreOnly && !server.SecureCore {
+		return true
+	}
+
+	if *selection.TorOnly && !server.Tor {
+		return true
+	}
+
+	if *selection.P2POnly && !server.P2P {
+		return true
+	}
+
 	if filterByPossibilities(server.Country, selection.Countries) {
 		return true
 	}