Warm up PowerShell Worker before receiving function load request #485
Description
When the worker starts on an Antares placeholder, it spends some time just waiting for requests, as it does not belong to any app yet. It could use this time to perform some app-independent warm-up: for example, create a PS runspace, load some app-independent modules and assemblies, open and read some files to make sure they are in the cache, etc. When the placeholder is assigned to an app and the real work starts, this preliminary warm-up should reduce the cold start time.