feat(ivy): capture the identifier of a decorator during reflection (#26860)

Previously the ReflectionHost API only returned the names of decorators
and not a reference to their TypeScript Identifier. This commit adds
the identifier itself, so that a consumer can write references to the
decorator.

Testing strategy: this commit is trivial, and the functionality will be
exercised by downstream tests.

PR Close #26860

packages/compiler-cli/src/ngcc/src/host/fesm2015_host.ts

@@ -572,6 +572,7 @@ export class Fesm2015ReflectionHost extends TypeScriptReflectionHost implements
       const decoratorIdentifier = decoratorExpression;
       return {
         name: decoratorIdentifier.text,
+        identifier: decoratorIdentifier,
         import: this.getImportOfIdentifier(decoratorIdentifier),
         node: call,
         args: Array.from(call.arguments)
@@ -634,6 +635,7 @@ export class Fesm2015ReflectionHost extends TypeScriptReflectionHost implements
           if (typeIdentifier && ts.isIdentifier(typeIdentifier)) {
             decorators.push({
               name: typeIdentifier.text,
+              identifier: typeIdentifier,
               import: this.getImportOfIdentifier(typeIdentifier), node,
               args: getDecoratorArgs(node),
             });