[Feature Request] periodically re-emits Worker Metrics regardless of state transitions

[billrich2001]

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

task_slots_used, task_slots_available, and num_pollers metrics only get emitted from the SDK during a transition in the worker's state

Describe the solution you'd like

periodically re-emits these gauges regardless of state transitions

Additional context

In a longer running workflow where workers only allow 1 task slot, these metrics can appear dead since there is nothing being emitted since there are no worker state changes.
Temporal internal support ticket 30539

[Sushisource]

@billrich2001 Is this with a Prometheus or Otel exporter? The issue here is that this is kinda just... how metrics work. It's wasteful to emit metrics for which there has not been any change. Typically it is the responsibility of the metrics ingestion system to report these metrics as unchanging, rather than "dead", during such times.

More detail about the exporter/ingestion/visualization setup here would help