Consume NuGet /embed assets group for interop type assemblies from NuGet package

[nkolev92]

This is the tracking issue to update build tasks to consume new /embed assets group from NuGet packages for interop type assemblies so that they are passed as link instead of ref to compiler.

Corresponding NuGet issue# NuGet/Home#2365

[nkolev92]

@jjmew @tmeschter

We had a question around functionality.
Can we have this re triaged and get an estimate on it?
Thanks.

[tmeschter]

@nkolev92 I take it this functionality already exists for SDK-style projects?

[nkolev92]

Not yet, dotnet/sdk#2732.

We were doing triaging on NuGet.Client side and came across these.

cc @aortiz-msft

[jjmew]

Let me sync up with @aortiz-msft