refactor(compiler): split compiler and core (#18683)

After this, neither @angular/compiler nor @angular/comnpiler-cli depend
on @angular/core.

This add a duplication of some interfaces and enums which is stored
in @angular/compiler/src/core.ts

BREAKING CHANGE:
- `@angular/platform-server` now additionally depends on
  `@angular/platform-browser-dynamic` as a peer dependency.


PR Close #18683

packages/platform-browser-dynamic/src/private_export.ts

@@ -6,5 +6,7 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
+export {CompilerImpl as ɵCompilerImpl} from './compiler_factory';
+export {platformCoreDynamic as ɵplatformCoreDynamic} from './platform_core_dynamic';
 export {INTERNAL_BROWSER_DYNAMIC_PLATFORM_PROVIDERS as ɵINTERNAL_BROWSER_DYNAMIC_PLATFORM_PROVIDERS} from './platform_providers';
 export {ResourceLoaderImpl as ɵResourceLoaderImpl} from './resource_loader/resource_loader_impl';