As we are rolling out the user profile feature, we'd like to expand the [Usage API](https://www.elastic.co/guide/en/elasticsearch/reference/current/usage-api.html) to report usage stats of user profiles such as (1) number of enabled user profiles and (2) number of user profiles that are [activated](https://www.elastic.co/guide/en/elasticsearch/reference/current/security-api-activate-user-profile.html) over the past X days. 

Response of the Usage API already contains a `security` field that groups relevant stats from security related features. We expect the new stats for user profiles should be added under it as well, for example:
```
{
  "security: {
    "user_profile": {
      "activated": 78,
      "recently_activated": 42  <1>
    }
  }
}
```
<1> The use of `recently_` is chosen to avoid the field to be tied to a specific time period so it is easier to evolve the definition in future.

x-pack/plugin/security/src/main/java/org/elasticsearch/xpack/security/SecurityUsageTransportAction.java
final ActionListener<Map<String, Object>> realmsUsageListener = ActionListener.wrap(realmsUsage -> {
            realmsUsageRef.set(realmsUsage);
            doCountDown.run();
        }, listener::onFailure);
        if (rolesStore == null || enabled == false) {
            rolesStoreUsageListener.onResponse(Collections.emptyMap());
        } else {
            rolesStore.usageStats(rolesStoreUsageListener);
        }
        if (roleMappingStore == null || enabled == false) {
            roleMappingStoreUsageListener.onResponse(Collections.emptyMap());
        } else {
            roleMappingStore.usageStats(roleMappingStoreUsageListener);
        }
        if (realms == null || enabled == false) {
            domainsUsageRef.set(Map.of());
            realmsUsageListener.onResponse(Collections.emptyMap());
        } else {
            domainsUsageRef.set(realms.domainUsageStats());
            realms.usageStats(realmsUsageListener);
        }
    }
    static Map<String, Object> sslUsage(Settings settings) {
        
        
        if (XPackSettings.SECURITY_ENABLED.get(settings)) {
            Map<String, Object> map = Maps.newMapWithExpectedSize(2);
            map.put("http", singletonMap("enabled", HTTP_SSL_ENABLED.get(settings)));
            map.put("transport", singletonMap("enabled", TRANSPORT_SSL_ENABLED.get(settings)));
            return map;