refactor(@angular/build): Auto-CSP support as an index file transformation. #28639

…ation. Auto-CSP is a feature to rewrite the `<script>` tags in a index.html file to either hash their contents or rewrite them as a dynamic loader script that can be hashed. These hashes will be placed in a CSP inside a `<meta>` tag inside the `<head>` of the document to ensure that the scripts running on the page are those known during the compile-time of the client-side rendered application.