feat(compiler): implement style encapsulation for new view engine (#14518)

Included refactoring:
- splits the `RendererV2` into a `RendererFactoryV2` and a `RendererV2`
- makes the `DebugRendererV2` a private class in `@angular/core`
- remove `setBindingDebugInfo` from `RendererV2`, but rename `RendererV2.setText` to 
  `RendererV2.setValue` and allow it on comments and text nodes.

Part of #14013

modules/@angular/compiler/src/view_compiler/view_builder.ts

@@ -386,7 +386,7 @@ function createViewTopLevelStmts(view: CompileView, targetStatements: o.Statemen
 
 
   const renderCompTypeVar: o.ReadVarExpr =
-      o.variable(`renderType_${identifierName(view.component.type)}`);  // fix highlighting: `
+      o.variable(view.renderComponentTypeName);  // fix highlighting: `
   if (view.viewIndex === 0) {
     let templateUrlInfo: string;
     if (view.component.template.templateUrl == identifierModuleUrl(view.component.type)) {