Need a way to indicate dependencies on other projects

Currently MSBuild uses `` items to indicate dependencies between projects and there's logic in the common targets to ensure that the build order is correct and ProjectReferences are respected.

However it is my current understanding that this is specific to typical C# projects, and there's no MSBuild generic way to indicate a project's dependency on other projects. There also doesn't seem to be a way to hint to the solution build in which order to build the projects, apart from the ProjectReference mechanism.

If so, we need to design a generic way to indicate dependency across projects, to minimize work and initially building the projects in the right order vs. imperatively triggering a build for dependencies once we encounter the dependency.