Provide integration with Cake.Issues

[pascalberger]

Cake Issues (https://cakeissues.net/) is a set of addins for Cake to work with analyzer and linter results, create reports or report the results back as pull request annotations. It has a modular architecture supporting different issue providers (https://cakeissues.net/docs/fundamentals/architecture), which all then can be used together with reporting and pull request integration addins.

It would be nice if there would be an issue provider for Cake Dotnet Vulnerability scanner, which would report an issue for every vulnerability it found together with the file and line information in the csproj.

Since an issue provider would need a dependency on Cake.Issues addin it would make sense to have this integration in a separate Cake.Issues.VulnerabilityScanner addin, implementing the issue provider (see https://cakeissues.net/docs/extending/issue-provider/overview for details), but could make sense to have its code living also in this repository and using the same lifecycle as the addin.