CalculateDeltaNode make non-blocking on find latest telemetry

[smatvienko-tb]

Is your feature request related to a problem? Please describe.

The problem is the CalculateDeltaNode makes a blocking call to the timeseriesService.findLatestSync
This blocks rule-dispatcher worker thread(s) and reduces the rule engine's overall performance and latency.

Describe the solution you'd like

Refactor the rule-node to call a truly async functions only
Remove or deprecate timeseriesService.findLatestSync as it is only place that uses

Describe alternatives you've considered

See the MathNode implementation on how to maintain ordered async executions in a non-blocking way

Additional context

ThingsBoard 3.6.2