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/assertions.ts

@@ -6,11 +6,8 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {isDevMode} from '@angular/core';
-
-
 export function assertArrayOfStrings(identifier: string, value: any) {
-  if (!isDevMode() || value == null) {
+  if (value == null) {
     return;
   }
   if (!Array.isArray(value)) {
@@ -34,7 +31,7 @@ const INTERPOLATION_BLACKLIST_REGEXPS = [
 export function assertInterpolationSymbols(identifier: string, value: any): void {
   if (value != null && !(Array.isArray(value) && value.length == 2)) {
     throw new Error(`Expected '${identifier}' to be an array, [start, end].`);
-  } else if (isDevMode() && value != null) {
+  } else if (value != null) {
     const start = value[0] as string;
     const end = value[1] as string;
     // black list checking