feat(@angular/create): add support to bun package manager

This commit adds support to use `bun` as a package manager.

Closes #26837

Author: alan-agius4

packages/angular/create/README.md

@@ -23,3 +23,9 @@ yarn create @angular [project-name] [...options]
 ```
 pnpm create @angular [project-name] [...options]
 ```
+
+### bun
+
+```
+bun create @angular [project-name] [...options]
+```

packages/angular/create/src/index.ts

@@ -17,7 +17,7 @@ const hasPackageManagerArg = args.some((a) => a.startsWith('--package-manager'))
 if (!hasPackageManagerArg) {
   // Ex: yarn/1.22.18 npm/? node/v16.15.1 linux x64
   const packageManager = process.env['npm_config_user_agent']?.split('/')[0];
-  if (packageManager && ['npm', 'pnpm', 'yarn', 'cnpm'].includes(packageManager)) {
+  if (packageManager && ['npm', 'pnpm', 'yarn', 'cnpm', 'bun'].includes(packageManager)) {
     args.push('--package-manager', packageManager);
   }
 }