Consider creating and publishing a package for FrameworkReference resolution

[baronfel]

Is your feature request related to a problem? Please describe.

Interactive tools like REPLs (for example dotnet fsi) often want to use dlls from a given Framework when working in an interactive mode. They also typically need to resolve FrameworkReferences for the 'baseline' Microsoft.NETcore.App to have a minimum level of functionality. Right now these resolutions are often ad-hoc, finding the SDK directory in use and doing relative pathing. This is fragile to resolution changes in future SDKs.

Describe the solution you'd like

It would be great if the logic in the FrameworkResolution targets was consumable in another form, so that custom FrameworkReference resolution logic that may be duplicated in other projects could be centralized and made consistent.

Additional context

An example use case can be found at dotnet/fsharp#13969 (comment)