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>

public/app/types/user.ts

@@ -131,3 +131,17 @@ export interface UserListAdminState {
   isLoading: boolean;
   sort?: string;
 }
+
+export interface UserAnonymousDeviceDTO {
+  login?: string;
+  clientIp: string;
+  deviceId: string;
+  userAgent: string;
+  updatedAt: string;
+  lastSeenAt: string;
+  avatarUrl?: string;
+}
+
+export interface UserListAnonymousDevicesState {
+  devices: UserAnonymousDeviceDTO[];
+}