collect code coverage and publish as part of tests

[hahn-kev]

Describe the feature
Dotnet supports code coverage via coverlet, it's already there and setup, we just need to use it and figure out how to publish the coverage, not sure what github integration exists? or maybe just an html report?

Who is this feature for?
devs

[hahn-kev]

Just came across https://coveralls.io/ which looks like it would handle reporting for us, it also comments on the PR with coverage changes which would be interesting.