test(ivy): add canonical compiler spec for class/style (#22719)

Adds a stub for `elementStyle` and `elementClass` instruction
with a canonical spec for the compiler. The spec shows the the
compiler should be using `elementStyle` and `elementClass` instruction
in place of `[class]` and `[style]` bindings respectively.
PR Close #22719

packages/core/src/render3/interfaces/renderer.ts

@@ -121,6 +121,7 @@ export interface RNode {
 export interface RElement extends RNode {
   style: RCssStyleDeclaration;
   classList: RDomTokenList;
+  className: string;
   setAttribute(name: string, value: string): void;
   removeAttribute(name: string): void;
   setAttributeNS(namespaceURI: string, qualifiedName: string, value: string): void;