Add support for job summaries

[BernieWhite]

Currently PSRule supports output of results to markdown. When originally implemented output to markdown was designed to be reasonably verbose.

GitHub Actions now supports job summaries.

Adding support to better generate job summaries in GitHub Actions and for other CI systems would improve output an readability of results particularly when multiple failures are found. Since GitHub Actions doesn't shows only the first N failures in action results.

Related to Azure/ResourceModules#2026