Auth: Add anonymous users view and stats (#78685)

* Add anonymous stats and user table

- anonymous users users page
- add feature toggle `anonymousAccess`
- remove check for enterprise for `Device-Id` header in request
- add anonusers/device count to stats

* promise all, review comments

* make use of promise all settled

* refactoring: devices instead of users

* review comments, moved countdevices to httpserver

* fakeAnonService for tests and generate openapi spec

* do not commit openapi3 and api-merged

* add openapi

* Apply suggestions from code review

Co-authored-by: Alex Khomenko <Clarity-89@users.noreply.github.com>

* formatin

* precise anon devices to avoid confusion

---------

Co-authored-by: Alex Khomenko <Clarity-89@users.noreply.github.com>
Co-authored-by: jguer <me@jguer.space>

pkg/api/http_server.go

@@ -16,6 +16,7 @@ import (
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/promhttp"
 
+	"github.com/grafana/grafana/pkg/services/anonymous"
 	grafanaapiserver "github.com/grafana/grafana/pkg/services/grafana-apiserver"
 	"github.com/grafana/grafana/pkg/services/grafana-apiserver/endpoints/request"
 
@@ -206,6 +207,7 @@ type HTTPServer struct {
 	promRegister         prometheus.Registerer
 	clientConfigProvider grafanaapiserver.DirectRestConfigProvider
 	namespacer           request.NamespaceMapper
+	anonService          anonymous.Service
 }
 
 type ServerOptions struct {
@@ -247,7 +249,7 @@ func ProvideHTTPServer(opts ServerOptions, cfg *setting.Cfg, routeRegister routi
 	accesscontrolService accesscontrol.Service, navTreeService navtree.Service,
 	annotationRepo annotations.Repository, tagService tag.Service, searchv2HTTPService searchV2.SearchHTTPService, oauthTokenService oauthtoken.OAuthTokenService,
 	statsService stats.Service, authnService authn.Service, pluginsCDNService *pluginscdn.Service,
-	starApi *starApi.API, promRegister prometheus.Registerer, clientConfigProvider grafanaapiserver.DirectRestConfigProvider,
+	starApi *starApi.API, promRegister prometheus.Registerer, clientConfigProvider grafanaapiserver.DirectRestConfigProvider, anonService anonymous.Service,
 ) (*HTTPServer, error) {
 	web.Env = cfg.Env
 	m := web.New()
@@ -348,6 +350,7 @@ func ProvideHTTPServer(opts ServerOptions, cfg *setting.Cfg, routeRegister routi
 		promRegister:                 promRegister,
 		clientConfigProvider:         clientConfigProvider,
 		namespacer:                   request.GetNamespaceMapper(cfg),
+		anonService:                  anonService,
 	}
 	if hs.Listener != nil {
 		hs.log.Debug("Using provided listener")