[Draft]: Introduce mode for project graph construction to load entire graph

[jeffkl]

Fixes #

Context

Changes Made

Introduced a new ProjectGraphOptions struct because project graph construction happens in a constructor and adding a new overload seemed like a worse design. This way we can add new options to the struct and not keep having to modify the constructor.

var projectGraph = new ProjectGraph(
    new ProjectGraphOptions
    {
        EntryPoints = [new ProjectGraphEntryPoint("path")],
        Mode = ProjectGraphMode.Full
    });

In the new mode, SetTargetFramework is ignored during graph construction and all outer and inner builds are evaluated. If the "full" graph was used for a build, it would technically over build, but this graph will be used by NuGet in for restore.

Testing

Notes