Cache unit of measurements when creating physical time series #580
Description
When creating a physical time series we unconditionally load all units of measurements from Mesh. The list is rather fixed, so it seems this is redundant when e.g. mass creating physical time series.
A better approach would be to cache the units of measurement.
This impacts performance of workloads where we are creating a lot of time series as we drop one RPC request for every created physical time series.