Azure.ClientSdk.Analyzers_0.1.1-dev.20200511.2

Artifact Metadata Driven Docs Release (#563)

* move artifact parsing functionality FROM create-tags-and-git-release.ps1 INTO artifact-metadata-parsing.ps1

* update artifact-metadata-parsing to re-use Invoke-WebRequestWithHandling for all requests

* update artifact metadata parsing to explicitly call `New-ChildItem` instead of relying on the method of using `mkdir` alias.

* update git-branch-push to add all changes.

* extend artifact metadata parsing to also grab readme content if present

* Update SemVer.ps1 to make the regex re-usable outside the class

* add update-docs-metadata.ps1. A powershell script that updates a documentation repo based on artifacts being released.

* create new yaml that can be called from a release. wraps `update-docs-metadata` and encapsulates the whole process, including doc repo checkout and pull request creation.