Add status of remote cache and cluster members to server info view

[ahus1]

For users of Keycloak, there should be a simple way to determine if the cluster has been formed correctly if JGroups is being used.

Possibly in DefaultInfinispanConnectionProviderFactory implement ServerInfoAwareProviderFactory and provide the information so it is available in the server view. This way an admin can check if the cluster has formed successfully.

[ahus1]

@mhajas - I wonder if this could help with cases like the one you are currently analyzing. WDYT? What should be visible in the server info tab in the Admin UI wrt to Infinispan / JGroups?

cc: @pruivo, @ryanemerson

[ryanemerson]

+1 from me. I think including both the local (embedded or remote) cluster and site view would be useful. For remote-cache it might also be useful to include the client's topology of available Infinispan nodes.

There's already a Keycloak issue requesting such a resource, as a similar one was available on the old WFLY based server: keycloak/keycloak#11086