Using TModel in ViewImports causes compile errors at design time

[NTaylorMullen]

We generate directive helper statements to provide intellisense for @inject IHtmlHelper<TModel> that look like:

((System.Action)(() => {
    global::Microsoft.AspNetCore.Mvc.Rendering.IHtmlHelper<TModel> __typeHelper = null;
}
))();

The problem is TModel isn't a valid C# term. @pranavkm got around this in the past by essentially doing a using TModel = dynamic statement at the top of the file.

[ajaybhargavb]

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