Please Update all of things to using TypeSpec instead of AutoRest

ITNOA

As you can know based on https://github.com/Azure/autorest/issues/5175 autorest is deprecated, so I need PowerShell plugin ports to typespec, and all name and docs updates to using with typesepc

thanks

Start by reviewing the linked AutoRest deprecation issue and inventorying the PowerShell plugin's names and documentation. The issue does not identify files or tests; done would mean the plugin is ported and all applicable names and docs consistently refer to TypeSpec.

Written by the indexing model from the issue text.