feat: tree-shakeable providers API updates (#22655)

Rename @Injectable({scope -> providedIn}).

Instead of {providedIn: APP_ROOT_SCOPE}, accept {providedIn: 'root'}.
Also, {providedIn: null} implies the injectable should not be added
to any scope.

PR Close #22655

packages/compiler/src/compile_metadata.ts

@@ -140,7 +140,7 @@ export interface CompileInjectableMetadata {
   symbol: StaticSymbol;
   type: CompileTypeMetadata;
 
-  module?: StaticSymbol;
+  providedIn?: StaticSymbol;
 
   useValue?: any;
   useClass?: StaticSymbol;