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/core/src/render.ts

@@ -7,4 +7,4 @@
  */
 
 // Public API for render
-export {RENDERER_V2_DIRECT, RenderComponentType, Renderer, RendererV2, RootRenderer} from './render/api';
+export {ComponentRenderTypeV2, RenderComponentType, Renderer, RendererFactoryV2, RendererV2, RootRenderer} from './render/api';