Add the global concurrency-safe increment counter

Proposal

As a user for this plugin, I would like to use global counter, e.g. for IDs or for cursor-alike APIs. To do that, there should be a concurrency-safe increment logic, maybe offered as a handlebars Marco. Other similar methods would be nice as well

As a bonus point, it would be nice to use the storage API to ensure that it remains concurrency-safe even when HA-alike features re used, but I think it is for the future and needs API review together with @tomakehurst

References

No response