message: fix: convert serviceMap API to POST
diff: @@ -273,7 +273,7 @@ func (aH *APIHandler) RegisterRoutes(router *mux.Router) {
  router.HandleFunc("/api/v1/service/top_endpoints", ViewAccess(aH.getTopEndpoints)).Methods(http.MethodPost)
  router.HandleFunc("/api/v1/traces/{traceId}", ViewAccess(aH.searchTraces)).Methods(http.MethodGet)
  router.HandleFunc("/api/v1/usage", AdminAccess(aH.getUsage)).Methods(http.MethodGet)
  - router.HandleFunc("/api/v1/serviceMapDependencies", ViewAccess(aH.serviceMapDependencies)).Methods(http.MethodGet)
  + router.HandleFunc("/api/v1/serviceMapDependencies", ViewAccess(aH.serviceMapDependencies)).Methods(http.MethodPost)
  router.HandleFunc("/api/v1/settings/ttl", AdminAccess(aH.setTTL)).Methods(http.MethodPost)
  router.HandleFunc("/api/v1/settings/ttl", ViewAccess(aH.getTTL)).Methods(http.MethodGet)
  