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/compiler/src/style_compiler.ts

@@ -6,10 +6,8 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {ViewEncapsulation} from '@angular/core';
-
 import {CompileDirectiveMetadata, CompileIdentifierMetadata, CompileStylesheetMetadata, identifierModuleUrl, identifierName} from './compile_metadata';
-import {CompilerInjectable} from './injectable';
+import {ViewEncapsulation} from './core';
 import * as o from './output/output_ast';
 import {ShadowCss} from './shadow_css';
 import {UrlResolver} from './url_resolver';
@@ -31,7 +29,6 @@ export class CompiledStylesheet {
       public meta: CompileStylesheetMetadata) {}
 }
 
-@CompilerInjectable()
 export class StyleCompiler {
   private _shadowCss: ShadowCss = new ShadowCss();