Extract code analysis to its own build slice and update analyzers to latest versions

[MattKotsenas]

This is a preparatory refactoring change for the test updates.

1. Move code analysis build settings from the compiler slice to its own codeanalysis slice
2. Update Microsoft.CodeAnalysis.Analyzers, Roslynator.Analyzers, and StyleCop.Analyzers to their latest versions
3. Fix some duplicate definitions between the slices and the projects
4. Move Microsoft.CodeAnalysis.CSharp.Workspaces out of the code analysis slice because it's part of the analyzer's public API and not a private code analyzer

[rjmurillo]

LGTM. Thanks for organizing the code analysis stuff into a single place