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/core/testing/src/test_compiler.ts

@@ -45,6 +45,12 @@ export class TestingCompiler extends Compiler {
    * `compileModuleAndAllComponents*`.
    */
   getComponentFactory<T>(component: Type<T>): ComponentFactory<T> { throw unimplemented(); }
+
+  /**
+   * Returns the component type that is stored in the given error.
+   * This can be used for errors created by compileModule...
+   */
+  getComponentFromError(error: Error): Type<any>|null { throw unimplemented(); }
 }
 
 /**