[Feature Request] Possibly add config options for exporting time metrics in seconds w/ unit suffix

[Sushisource]

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

Core exports time metrics in ms where Go / Java use seconds and optionally add a _seconds suffix to the metric names.

Describe the solution you'd like

It's not clear that adding this config option to Core and handling it there makes sense post merge of https://github.com/temporalio/sdk-core/pull/544

But we should consider how we want that to work once someone's done a lang implementation of that interface

Additional context