Add `DefaultEditorTemplates.MultilineTemplate`

- #965
- test call-throughs from `Html.Editor[For]()` to inner `IHtmlHelper`
 - add another parameter to `DefaultTemplatesUtilities.GetHtmlHelper()`

nit: reorder dictionaries at the top of `TemplateRenderer` slightly

/cc @pranavkm  or @NTaylorMullen 
```C#
name: string.Empty,
value: html.ViewContext.ViewData.TemplateInfo.FormattedModelValue.ToString(),
```