New CI/CD using GH actions

[hjorslev]

PR Summary

New CI/CD using GH Actions. Based on the work found in https://github.com/santisq/PSParallelPipeline/

Minor adjustment so the module version is coming from the GitHub Release tag.

Context

Update the CI/CD system so it is centered around GitHub Releases. When a new release is published using GitHub Releases the module is built and published to the PowerShell Gallery.

Changes

• Adds fully working CI/CD workflow using GitHub Actions.
• Removes AppVeyor and Azure Pipelines.

Checklist

• Pull Request has a meaningful title.
• Summarized changes.
• Pull Request is ready to merge & is not WIP.
• Added tests / only testable interactively.
  • Make sure you add a new test if old tests do not effectively test the code changed.
• Added documentation / opened issue to track adding documentation at a later date.

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