feat(@angular/build): introduce new official build system package

The `@angular/build` package has been introduced to house the esbuild/Vite-based
build system that was newly introduced as stable in v17. The existing
`@angular-devkit/build-angular` package will continue to contain the Webpack-based
build system and to ensure backwards compatibility it will also provide aliases
for the esbuild/Vite-based build system. The changes here are the first stage
of the builder transition and moves the `application` builder into the new package.
The application builder can now be accessed when this package is installed directly
via `@angular/build:application`.

No changes are required for existing projects.

Author: clydin

Diff for: .monorepo.json

@@ -2,6 +2,17 @@
   "packages": {
     "@_/builders": {},
     "devkit": {},
+    "@angular/build": {
+      "name": "Angular Build System",
+      "section": "Tooling",
+      "links": [
+        {
+          "label": "README",
+          "url": "/packages/angular/build/README.md"
+        }
+      ],
+      "snapshotRepo": "angular/angular-build-builds"
+    },
     "@angular/cli": {
       "name": "Angular CLI",
       "section": "Tooling",

Diff for: CONTRIBUTING.md

@@ -211,6 +211,7 @@ The scope should be the name of the npm package affected as perceived by the per
 
 The following is the list of supported scopes:
 
+* **@angular/build**
 * **@angular/cli**
 * **@angular/create**
 * **@angular/pwa**