Content Security Policy and SPAs

### Which @angular/* package(s) are relevant/related to the feature request?

_No response_

### Description

Currently CSP and SPAs don't work well together.

There is however something very simple we could do to make CSP 100% compatible with SPA.

### Proposed solution

When Angular builds the app, also output a file called hashes.json. This file contains a list of hashes of all of the bootstrap js scripts. Then, in your backend, say asp.net core, you read this file and add the hashes to your CSP header.

This would be a very simple change that would make a lot of people's lives much easier.

### Alternatives considered

- AutoCSP is not ideal because it uses the meta tag, not http headers.
- Setting the nonce to CSP_NONCE doesn't work with strict-dynamic.
- Setting the nonce in index.html breaks caching.

從 Angular CLI 建置流程開始，檢查 bootstrap JavaScript 和 index.html 的處理方式。定義 hashes.json 的輸出格式，並驗證其中列出了所有 bootstrap 指令碼的雜湊值，以便後端可以在其 CSP 標頭中使用這些雜湊值。

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