When code-gening inherited chunks that replace TModel token, wrap it in line pragmas

[pranavkm]

As part of directive inheritance from _GlobalImports, we perform a string replacement on certain kinds of chunks to change the token TModel real model type. For e.g., GlobalImport might contain @inject IFoo<TModel> MyFoo which gets code-gened as public IFoo<MyRealModel> MyFoo { get; set; }.

We should instead code-gen this with line pragmas as

public IFoo<
#line 23 something.cshtml
MyRealModel
#line hidden
> { get; set; }

This will ensure errors related to MyRealModel (misspelt type name etc) map to the view file correctly.