Move archetype-sdk-tool-pwsh.yml to common folder

As we expect to have as many pester tests as possible for powershell script, it's better to run tests in PR.

To setup the pipeline, the very first step is to move common [step](https://github.com/Azure/azure-sdk-tools/blob/main/eng/pipelines/templates/stages/archetype-sdk-tool-pwsh.yml) to eng/common, so all repos can leverage the infrastructure.

Furthermore, it is better to support the pipeline-generation as well, so people don't need to add new pipeline manually.