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": {

packages/compiler-cli/tsconfig-build.json

@@ -1,29 +1,23 @@
 {
+  "extends": "../tsconfig-build.json",
+
   "compilerOptions": {
-    "baseUrl": ".",
-    "declaration": true,
-    "experimentalDecorators": true,
-    "noImplicitAny": true,
-    "strictNullChecks": true,
     "module": "commonjs",
-    "outDir": "../../dist/packages/compiler-cli",
+    "stripInternal": false,
+    "target": "es5",
+    "baseUrl": ".",
+    "rootDir": ".",
     "paths": {
       "@angular/compiler": ["../../dist/packages/compiler"],
       "@angular/tsc-wrapped": ["../../dist/packages-dist/tsc-wrapped"]
     },
-    "rootDir": ".",
-    "sourceMap": true,
-    "inlineSources": true,
-    "target": "es5",
-    "lib": [
-      "es6",
-      "dom"
-    ],
-    "skipLibCheck": true
+    "outDir": "../../dist/packages/compiler-cli"
   },
+
   "exclude": [
     "integrationtest"
   ],
+
   "files": [
     "index.ts",
     "ngtools2.ts",