Add anonymous usage metrics collection (#508)

This will help us understand usage on self-hosted deployments

The collection may be disabled by using the flag --disable-anonymous-metrics or 
NETBIRD_DISABLE_ANONYMOUS_METRICS in setup.env

management/server/store.go

@@ -21,4 +21,6 @@ type Store interface {
 	SaveAccount(account *Account) error
 	GetPeerRoutes(peerKey string) ([]*route.Route, error)
 	GetRoutesByPrefix(accountID string, prefix netip.Prefix) ([]*route.Route, error)
+	GetInstallationID() string
+	SaveInstallationID(id string) error
 }