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

integration/hello_world__closure/closure.conf

@@ -13,18 +13,20 @@
 node_modules/zone.js/dist/zone_externs.js
 
 --js node_modules/rxjs/**.js
---process_common_js_modules
+
+--js node_modules/@angular/core/package.json
+--js node_modules/@angular/core/esm15/index.js
+--js node_modules/@angular/core/src/testability/testability.externs.js
+
+--js node_modules/@angular/common/package.json
+--js node_modules/@angular/common/esm15/index.js
+
+--js node_modules/@angular/platform-browser/package.json
+--js node_modules/@angular/platform-browser/esm15/index.js
+
 --module_resolution=node
-
-node_modules/@angular/core/@angular/core.js
---js_module_root=node_modules/@angular/core
-node_modules/@angular/core/src/testability/testability.externs.js
-
-node_modules/@angular/common/@angular/common.js
---js_module_root=node_modules/@angular/common
-
-node_modules/@angular/platform-browser/@angular/platform-browser.js
---js_module_root=node_modules/@angular/platform-browser
+--package_json_entry_names es2015
+--process_common_js_modules
 
 --js built/**.js
 --entry_point=built/src/main

integration/hello_world__closure/package.json

@@ -11,7 +11,7 @@
     "@angular/platform-browser": "file:../../dist/packages-dist/platform-browser",
     "@angular/platform-server": "file:../../dist/packages-dist/platform-server",
     "@angular/tsc-wrapped": "file:../../dist/packages-dist/tsc-wrapped",
-    "google-closure-compiler": "20170409.0.0",
+    "google-closure-compiler": "git+https://github.com/alexeagle/closure-compiler.git#packagejson.dist",
     "rxjs": "5.3.1",
     "typescript": "~2.3.1",
     "zone.js": "0.8.6"
@@ -29,4 +29,4 @@
     "preprotractor": "tsc -p e2e",
     "protractor": "protractor e2e/protractor.config.js"
   }
-}
+}