Add WorkerListInfo proto for efficient worker listing (#724)

## What changed?
- Add `WorkerListInfo` proto for List API (follows CHASM entity
conventions like `ActivityExecutionListInfo`, `ScheduleListEntry`)
- Add `workers` field to `ListWorkersResponse` returning `repeated
WorkerListInfo`
- Deprecate `workers_info` field in `ListWorkersResponse`

[Server PR](temporalio/temporal#9418)

## Why?
Listing many workers with full `WorkerInfo` (containing dynamic metrics)
is expensive. `WorkerListInfo` contains only static/slow-changing fields
for efficient listing.

## How did you test it?
- [x] make proto passes

## Potential risks
None - backward compatible.

Author: rkannan82