feat(ivy): support generation of flags for directive injection (#23345)

This change changes:
- compiler uses `directiveInject` instead of `inject` for `Directive`s
- unifies the flags in `di` as well as `render3`
- changes the signature of `directiveInject` to match `inject` In prep for #23330
- compiler now generates flags for injection.

Compiler portion of #23342
Prep for #23330

PR Close #23345

tools/public_api_guard/core/core.d.ts

@@ -376,8 +376,10 @@ export interface InjectDecorator {
 
 export declare const enum InjectFlags {
     Default = 0,
-    SkipSelf = 1,
+    Host = 1,
     Self = 2,
+    SkipSelf = 4,
+    Optional = 8,
 }
 
 export declare class InjectionToken<T> {