Standalone Activities: Durable job processing, now in Public Preview

What this post added

This post announces the Public Preview of Standalone Activities, a new capability that allows Temporal Activities to be executed independently of Workflows. It details how to invoke these activities using client calls with specific parameters like `id`, `task_queue`, and `start_to_close_timeout`. The post highlights the benefits of default durability, full visibility via stable IDs and UI/CLI/API, and the ability to reuse Activity code in both standalone jobs and Workflows. It also lists supported SDKs and core capabilities available in preview, along with planned features for General Availability.