build: publish tree of files rather than FESMs (#18541)

* Remove now unnecessary portions of build.
* Add a compilePackageES5 method to build ES5 from sources
* Rework all package.json and rollup config files to new format
* Remove "extends" from tsconfig-build.json files and fixup compilation roots

PR Close #18541

packages/compiler-cli/package.json

@@ -12,7 +12,7 @@
     "@angular/tsc-wrapped": "5.0.0-beta.5",
     "reflect-metadata": "^0.1.2",
     "minimist": "^1.2.0",
-    "tsickle": "^0.23.4",
+    "tsickle": "^0.23.6",
     "chokidar": "^1.4.2"
   },
   "peerDependencies": {